Hi Cattoo,
As I mentioned in my previous reply, Iâm sorry, but I canât diagnose comfort issues via an online forum, so I wouldnât be able to tell you what might or might not improve your comfort. I do wish that I could! 
Itâs nice that you were given a full refund to exchange to the 9" Simple Sleep â thatâs great service. So in effect you added 2" of ultra plush D55 Dunlop and the 6" support core went from D90 to D75 Dunlop â a softer overall product. And then you have your 2" plush Dunlop topper above that.
Your description of the pain seems to refer mostly toward a higher sensitivity on your right side, so more than likely this will be your âlimiting factorâ regarding comfort. As you mentioned feeling like âsleeping on the floorâ, even though you added 2" of soft Talalay and softened your support core, It could be that the transition between the soft upper layers to the support core it too distinct for you, and you might do better with a more gradual transition layer under your topper, such as a 2" layer of a more medium latex. It could also be that a bit more surface plushness could be assistive. And a third option could be that you could benefit from an uppermost layer that is contouring but just a bit slightly firmer than what you currently have.
As you mentioned rolling toward the center, what is your mattress placed upon, and what is the support network beneath that?
Replacing your topper with a very plush (15-19 ILD) piece of Talalay at 3" would increase the surface plushness of your mattress, and if that is the issue for your hip, that could be an improvement for you. There is always the risk of creating âtoo deepâ of a comfort cradle in the upper layers of a mattress, but you may have a specific situation where this is what works best for you, your body shape, and your sensitivities. If you do decide to pursue this, you may wish to consider toppers that can be returned.
Wool has a different surface comfort which some people do prefer, but it wonât be as soft as plush foam and it will tend to âfirm upâ the soft latex that is beneath it. This is not to say that this wouldnât work for you (sometimes a slightly firmer surface tension helps people with hips pains), but there is more information about wool toppers and how they compare to various foam toppers (at least in very general terms) in post #8 here and in posts #3 and #6 here and there are some additional comments about wool toppers and a list of some of the better sources Iâm aware of in post #3 here.
Phoenix