Ok that AS5 what about the thermal grizzley Kryonaut?Arctic Silver. You may need the driver in the grow area? You want fresh air and a temperature in the low 80*f.
Full throttle I'd be pushing 2237w with 2 fixtures so that's around 45 a sqft. My summers are terribly hot so I'll definitely need it thenThe mini split won't be needed unless your over 45watts sq/ft or if your sealed and running CO2( added dehumidifier heat). Most any quality paste will be fine.
I have the vero 29c seUse Arctic silver thermal paste and use chip holders, they aren't expensive.
Mount your drivers on the wall, thats fine.