Hi GameMasterXO,
I wouldn’t consider wool to be a “red flag” and as a matter of fact it would be more of a “green flag” because it is a very high quality fiber and IMO is much preferable to synthetic fibers.
Thinner layers of wool that are used as a fire barrier will have some effect on the feel of the layers under it (it can soften firmer layers or firm up softer layers depending on the amount and type of the wool layer itself) but this is neither “bad or good” and simply a part of the overall design and performance of the mattress. Fairly thin layers of densified wool can slightly reduce the compression of softer foam underneath it to a degree but the firmness/softness and thickness of the foam will have a bigger effect on how it feels than the wool. I would certainly prefer a wool quilting that is used for a fire barrier than other types of fire barrier and it certainly wouldn’t make the mattress “hard”. Thicker layers of wool (thicker than what is in the mattresses you are looking at) can even provide a cushioning effect for pressure points (although thicker layers will become firmer as they compress over time but they will never compact down to the same degree as cotton batting and will maintain resiliency because of the nature of wool fibers). I certainly hope I didn’t leave the impression somewhere that wool is an “undesirable” material because it certainly isn’t IMO. It’s a high quality component that is part of what provides the overall feel and performance of a mattress and does what it does (especially controlling humidity, ventilation, and temperature control) very well 
This would be “in the range” of an “average” core firmness but how firm this feels will depend on the other components as well and what each person considers to be soft or firm. The firmness of a mattress is a combination of the ILD’s of the layers in the mattress, the thickness of the mattress thinner layers or mattresses are firmer than thicker layers or mattresses, and the rest of the components (such as the ticking and quilting) and how they all interact. In addition to this … different people can have very different definitions or reference points for what is firm or soft depending on what they are used to, the type of softness they are most sensitive to (there are different types of soft depending on whether someone is more sensitive to support or comfort softness), their perceptions, and their body type and sleeping position.
There are several of the outlets in the DC list that offer latex mattresses that may be similar. Ikea for example has a 7" Dunlop latex mattress (which is partly synthetic) with a compressed wool layer in the quilting although they don’t provide information about the ILD of the latex. A few phone calls that describe what you are looking for will provide some latex options even though none of them will be exactly the same as Rocky Mountain. Savvy Rest for example also has a 6" Dunlop latex mattress with a wool quilted cover (and a 9" as well) where you can choose the firmness of the layers.
I suspect the 1" is the pre-compressed height of the wool rather than the actual compressed height. Wool density (such as oz/sq ft) will usually give you a good idea of how much wool is used but in most cases wool layers that are used for fire barriers are in the range of 1.8 oz/sq ft and are needle punched which means they are compressed. You can see some good information here about wool used as a fire barrier.
This is part of the risk of an online purchase and in most cases it’s a good idea to have a more detailed phone conversation with the manufacturer or retailer so that they can give you more information about how others of your general height/weight/sleeping position and circumstances have interacted with the mattresses you are considering. They will know more about how each mattress “works” for different people than anyone else. You will need to provide them with your body type information along with your normal sleeping positions and any other information that is relevant for them to have better odds of “fitting” you to the model or mattress that they offer which has the best odds of being suitable for your needs and preferences. It can also be important to know what options you have if an online purchase is “wrong” and you need to make adjustments or an exchange because this is also part of the “value equation” of an online purchase.
You have some “testing” options locally and perhaps even some purchase options but if these don’t “fit” what you are looking for either in terms of construction or value then you also have some good online options as well (including Rocky Mountain of course) but I would have a more detailed conversation with any of them that you are considering so you have some degree of confidence that the mattress you are considering along with any return/exchange policies they offer are within your “risk tolerance”.
Phoenix