What a good idea! Losing another months or 2 on a downgrade update of chapter 1 ! (anyone remember the dev losing time on Lisa's alternative dresses?) Seriously, close the first chapter, and leave it like that. the global quality is totally fine.
Difference between G3 and G8 are neglectable, and the global quality of the background is (pardon my honesty) terrible : definition is inferior; details quality is inferior (way too blurry!) and lightning is bad (are they using a yellow neon in the room?).
My 2 cents advice : leave it like that, change the model for chapter 2 if you want, but please focus on NEW CONTANT. Teasing, groping then fucking the girls. That's what we want. If you leave me the the choice bewteen : 1 - a new extended scenario, pics in 8K, and 3 new characters doing nothing, and 2 - Ann drunk in her bedroom wearing only a black garter belt with stockings and high heels, asking Max to fuck her hard in the ass... I vote 2!