I like your setup, and I like that you're using your drivers for different duties. Do you just not like Valkyries or other understable plastic to fill you understable drives? I bet you can probably make your seasoned dx teebird fly just about every line, but I prefer to use less effort to get these types of shots working for me. I'm sure your beat pro wraith is flippy, and the gap between your wraith and teebird isn't that big to worry about.
As far as the mids go, I would take your FLX Buzzz out of the bag a few rounds so you won't be tempted to throw it so you can really test out how well your wasp will fit into your bag. I carry a Z Buzzz, a Z Wasp and an FLX Buzzz in my bag as well, (also carry a Squall, but I use it for more as a fairway driver/mid off the tee for distance/turnover).
I use my Z Buzzz for straight longer midrange shots, my Z Wasp for wind or hyzers (or sometimes if I wanna run at a basket from a short tee, I'll snap my Wasp straight) and my FLX Buzzz for shorter controlled approaches. The FLX Buzzz just doesn't have the distance of the Z, but it's so dependable for me I can bring myself to take it out the bag just yet. I think you'd benifet from forcing yourself to use the Wasp because on a really windy day, it's sometimes tough to trust a Buzzz, and the Wasp will get you about the same D as your Z Buzzz will.
Guess I'm kinda partial to Wasps now since I just hit my first ace with one last weekend.