https://community.pcgamingwiki.com/files/file/2807-max-payne-flat-difficulty-vanilla-pc-values/
The existing script to remove adaptive difficulty uses the values from the mobile port, as stated. The problem with those is they are massively easier than even the minimum possible difficulty of the PC version, likely tuned for awkward touchscreen controls. They nearly triple the player's health (2.9 multiplier) and appear to make each painkiller dose fully heal to 100%. With those values you can stand still and take over a half dozen point blank shotgun blasts before dying.
I felt these comments (on another fix) were... not appropriate for the file upload description, so here they are, I suppose. If the file gets approved I guess I'll try and edit it in as an alternative.
EDIT: Okay, I did that! Literally the first wiki edit I've done here or anywhere, please be gentle if I screwed up. I swear I mean well.