Shine Supply/ Excel Evolution 5” Backing Plate, grease replacement, and new brushes. If that isn’t enough, working on technique, and if that still isn’t enough (the MKI’s don’t have a reputation for being all that powerful) then a pad upgrade or polisher upgrade may be in order.
Question: Have you tried stepping up your cutting fluid and pad combo in order to decrease machine speed?
Side Note: If I am given the chance to completely reset my pad inventory, I’d go with Lake Country HDO foam pads and their Foamed Interface and Extra Cut Lambswool pads. They rotate like nothing else I’ve ever used. These pads are over the Griots BOSS Foam Pads which are pretty good. The caveat is that the listed LC pads are pricey...
I see that you are using microfiber pads, personal experience has shown me that microfiber pads consistently run higher temps than the equivalent foam pad due to increase in friction between the pad and surface, no matter the polish or supplemental wetting agent. Unfortunately, given the correct conditions, we can heat cycle the adhesive of our backing plates with the upper bounds of temperature getting close to the temperature in which the adhesive becomes pliable, thus degrading our backing plates to the point of Velcro delaminating from the face of the backing plate.
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