Sry - I have no help for you, but a question: why do you want to stick at HS1?
I will not query your preference, but did you ever read the first paragraph from here
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?
"If you are coming from Honey Select 1"
Here you can see all the significant improvements of HS2 DX, especially the Graphical and Physical ones.
And not to forget: you have this forum on F95 with useful threads like this one or
https://f95zone.to/threads/illusion-ai-girl-and-honey-select-2-card-sharing-thread.44248/page-687
the reasons;
1)i dont like how fake and plastic renders feels most of the time (judging from hs2 pics and ai shoujo)
i do use modded ai shoujo which uses almost same engine and while sometimes game looks better in certain lighting its not always the case.
2)the doa bitches mods for hs2/ai look off.
the hs1 roy mods are perfect, for ai/hs2 they look off to me except tina and helena that seem close enough.
and since i cant do much good with weeb sliders mods are where its at
3)i have not seen a single new position in any screenshot from hs2
ai shoujo has like 3 or 5 more enviromental postions compared to hs1 and they are mostly not that great, i have not seen more in hs2
if there were good 3some animations in hs2 that would be worth it but i have not seen them and was told there are none
4)ridiculous size, my modded to the tit skyrim does not take 90 gigs
5)hassle to install all the mods and set first person mod
6)it seems that small hands bug is transient in hs2 and ai shoujo
it looks ridiculous its like protagonist hands are of 4 year old really shows in tit grabbing animations
u cant make em much bigger and they glitch, looks horrible in pov
7)their facial expressions seems worse