IMO, yes.... a smaller machine will definitely help you follow the contours of the mirror housing and keep the pad flatter. This will no only aid in correction ability but will reduce the 'pressure points' where the pad is only making contact with a tiny portion of the surface you are buffing.
I have also found that in comparison to a traditional 8mm throw DA the Flex gets more heat at the working face of the pad (and thus the paint) whereas the traditional DA tends to generate more heat at the velcro backing of the pad.
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