Fuel vs glow plug Q.

[lam66]

I've been reading all these posts on fuel and since I'm new to nitro I'm still trying to figure out a few things. I currently have a stock Savage X 4.6 and using Blue Thunder 20% fuel with stock glow plug and I live in Vegas where temps are currently in mid to upper 90's everyday. Engine is broke in and I thought running well since engine temps are usually 230s-240s but I'm not pulling wheelies or doing back flips off the ramp the way I would like. I was thinking about changing up some gears but had to ask the question about different % fuel and/or different glow plug for the current weather. And should I be changing glow plugs in winter and summer? Or am I still running this thing like a pig and need to lean out more? Occasionally when I punch it, it stalls and I'm thinking it's too rich but the guy at the LHS says my glow plugs look lean. Any ideas? Thanks.