If you've been doing regular drain/fills every 30K and now have 131K on the Acura I would continue to do that. I see very little that can be gained from a flush, which Acura/Honda does not recommend. It's my experience that Honda transmissions shift firmly, bordering on harsh at times. Not smooth like Toyota or GM. After all those miles and all the regular maintenance I'd say "it is what it is" as far as shift quality goes.