Hi zexpress,
I’m glad your topper already arrived, but I’m sorry it isn’t working well for you. 
Based upon the feedback you described here on the forum and to Novosbed, it certainly seemed to be the logical step, but this goes to further emphasize the importance of your own personal testing.
The Sequoia has wool and 1" of plush polyfoam on top, under which is 2" of 4 lb 14 ILD gel memory foam, 2" of D70 Dunlop latex, 2" of 1.8 lb 30 ILD ventilated poly foam and a 6" 1.8 lb 30 ILD polyfoam core. This would be a “foam mattress” like your Novosbed, but it would be more resilient on top than your current mattress.
Based upon your most recent feedback here and from your previous experiences from the past 18 months, it seems that you responded better to something with less comfort material on top, or what comfort material that is used was more resilient, not allowing you to have as deep of a “comfort cradle”. It doesn’t seem to be as much of an issue of deep support as surface support.
There is also more about primary or “deep” support and secondary or “surface” support and their relationship to firmness and pressure relief and the “roles” of different layers in a mattress in post #2 here and in post #4 here that may also be helpful in clarifying the difference between “support” and “pressure relief” and “feel” that may be useful as well.
If you do desire some with the motion deadening characteristics of memory foam, you may wish to stay with a thinner layer of the memory foam, such as the 2" in the Sequoia, as opposed to a total of 4"-5" of memory foam.
Phoenix