I've had a lot of experiences like this too

It really is a pain in the ___! The only thing I've done that seems to be working is reading my goals over and over especially before bed. I realized that once I get lucid, I instantly get flooded with the memories of what I wanna do, and when that happens, I rarely think about the dream ending at all. Same thing goes for stabilization. Lately I haven't been stabilizing at all as well, because of the said rush of memories which allows me to kinda "focus" on the task at hand and nothing else. The great thing is that because of the schema, the dream won't destabilize because I'm not thinking about it needing to. So it ends up alright. So..I'm rambling...so yea.. try to do some autosuggestion regarding something else you wanna focus on, to divert attention from those annoying dream-ending thoughts.

Hope this helps!