If you are “determined to figure this one out”, then get figuring! As I mentioned, a lot of fusing is about experimentation. I could give you a firing schedule that works in my kiln and the bottles I normally use, that would not work in your kiln with the glass you are using.(that is, if I fused bottles, which I don’t)
When I “google” fused glass bottle firing schedule, I come across many hits with firing schedules on how to fuse recycled glass (including links to posts on this forum). So… do a little googling and do some experimentation (keeping a firing log with good notes on the results) and you will “figure out” what works best in your kiln. Watch the glass while it is firing. If the bottles are not fired to your liking, increase the heat, increase the time… or both!
Jester’s Baubles Fused Glass Designs