Smooth edges are all about heat which in turn is all about the combination of speed, laser power, and air assist.
First of all, you don’t want to use more than about 3psi of air pressure for acrylic, otherwise it’ll cool too quickly making for opaque edges. Granted, you have an aquarium compressor so that’s probably about where you are at. Just noting it. Wood needs high pressure, but acrylic should always been JUST enough to prevent flame ups.
Otherwise basically either use higher power or, honestly the better option, cut slower. I know, you want to get things cut ASAP but if you cut quickly the acrylic cools too quickly to be “flame polished”. Just using higher laser power will only get you so far.
I pulled my hair out over this as well at first and the only thing (aside from low pressure air) that really made a difference was to just go slower. Which is so painful for 1/4" acrylic since you have to cut at ~10mm/s to get a nice edge. So it just comes down to if you care. If so, go slow.