Despite some appearances to the contrary through my opinions on recent changes I basically agree with @Talisman that you should try and keep all new content that appears stable within beta 4. I would guess that it's likely to be unforseen effects from optimisation (or possibly collision detection) that sent things wild for a while but it's really only you being familiar with the code and what changed that can judge what is and what is not suspect (and indeed what you have currently omitted).
There is no need to throw away all the quest merging and checking out subquest storylines, false flag detection etc by going too far back. It's only about a month ago you were looking at a possible public release but after that a lot got added in/moved around.
I don't know when you fixed the sea performance issue you found but that seems to be an essential.
Everything else (once stable) needs the wider audience for appreciation, bug finding and suggestions
There is no need to throw away all the quest merging and checking out subquest storylines, false flag detection etc by going too far back. It's only about a month ago you were looking at a possible public release but after that a lot got added in/moved around.
I don't know when you fixed the sea performance issue you found but that seems to be an essential.
Everything else (once stable) needs the wider audience for appreciation, bug finding and suggestions