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OK, I don’t think the smaller carbs are going to reduce the temperatures much. I remember the picture of your heat gun showing 190 degrees, but where on the engine/exhaust were you measuring the temp? That thing has many exhaust/water chambers separate from the powerhead, which may be designed to operate at higher temperatures. To be honest, I never had that much experience with the turbo jets to know the specifics. But, if the powerhead is truly at 190F, the overheat alarm should be going off at the console. Does that alarm work?
Again, did you ever add those nipples/elbows to the top of the heads that were used on the original powerhead? Or perhpas, you could swap the old heads back in place which are lower compression heads.