Bottom-Line Up Front: Sim Update 5 on 27-July isn’t going to change anything for you - the problems you have are addressed by using the mods below. Full stop.
Is there any reason you’re not using Working Title G3000 at least?
This is the future of the sim. Working Title code will become official “base” code to override the legacy programming in the sim. WT is fixing each Garmin to emulate Real Life 1:1 functionality. If nothing else, you are already missing Advisory VNAV available on G3000 which is not available on any other Garmin as of today. Also - TCAS Advisories, the weather WX, TAWS topographic maps, a whole bunch of good stuff that you find in the real G3000.
Secondly, MixMugz’ mod to the TBM fixes so many problems to the aircraft behavior, handling and even in-cockpit characteristics.
Just those two mods would change your flying experience for the better materially.
As for RNAV/ILS, feel free to read into this discussion. We’ve covered RNAV ad nauseum on that and other posts. No point recapping it here.