Fibromyalgia & Building DIY Latex Hybrid

Hello!

I’ve recently decided, after many weeks of research, to attempt building my own hybrid mattress using the components below. FYI, I suffer from fibromyalgia, and am a 5’4" and 210 lbs. female. Can you please help me determine the best combination for my mattress? I need the firm base for low back pain support, but also need the comfort for my pressure points, especially my shoulders.

Current order (unfulfilled):
Top: 2" Plush All Natural Talalay
Middle: 3" Firm All Natural Talalay
Bottom: 8" Combi-Zone Pocket Coil by Leggett and Platt

Potential Replacement Order:
Top: 2" Medium All Natural Talalay
Middle: 3" Firm All Natural Talalay
Bottom: 8" Combi-Zone Pocket Coil by Leggett and Platt

Would this be better??
Top: 2" Meduim All Natural Talalay
Middle: 3" Firm All Natural Dunlop
Bottom: 8" Combi-Zone Pocket Coil by Leggett and Platt

I understand that your recommendations have a 90% success rate, so I would greatly appreciate your help. Please let me know your thoughts. Thank you!

I would suggest 3" Medium Dunlop and 2" Plush Talalay over the Combi zone