Well I've only tried it for the last 2 days, but I did several things that seemed to function, including what as mentioned in that other thread that:
-I removed my weapons that I spawn with via trainer before and after duty
-I can start up GTA + RPH with LSPDFR again, no longer need to manually start LSPDFR after RPH load
-I installed PedPropLimitAdjuster
-Turns out I had both "GTAV Heap Adjuster" and "HeapAdjuster" asi.s in my game, which I found out I'm only supposed to have the latter
-Made sure my PackFileLimiterAdjuster had the correct amount of space (double the "ArchiveCount" from my current gameconfig)
I will also update my SimpleTrainer just in case, and delete my characters to be complete sure. I hope this helps someone in the future : )