FYI, I ordered the DGX 30lb S1. I asked DGX about the lack of mentioning any 8" tanks in the description and they said it would be perfectly fine with tanks like LP95 and HP117, which are what I'm considering. I skipped the STA for now.
Based on the OptimalBuoyancy spreadsheet, with the 30 lb wing & some estimates for my incoming dry suit based on my wetsuit, I can get 12 lbs of p-weight trim weights while keeping my rig self-buoyant on a full HP117. Estimates then call for a 17 lbs weight belt to sink me.
Thanks all.