Ridgid jointer?

Feed speed will affect the random nature of your scallop marks. The slower you go the less noticeable.

See pix

Until you dull the knives it will do better. Keep in mind that wood glue dulls knives quickly. I suspect the plastic is particularly hard on the knives.

The mill marks are from each cutter blade passing through the stock. Moving the material slower over the blade will make the edge smoother. Random width of the mill marks comes from not feeding the material at a constant speed and the speed changes of the motor as it slows with load. It is hard to say if the Ridgid jointer would do a better job. It depends on how large the pieces are and the operator of the machine. The cutter head speed on the Ridgid is much slower than the Delta so the difference from two to there blade cutters probably would not make a difference as you are getting more cuts per minute with the bench top Delta. One would think the Ridgid would do a better job. It is a much better machine than the bench top Delta, But if your material is just short pieces

A sharp block plane does a fine job cleaning up the edge on acrylic - once you get it flat and square with a jointer. You might have to get creative with clamping it, depending on how big/thick a sheet we're talking about.

Can't vouche for its use on acrylic but the machine is great. It came disassembled but the cutterhead and table adjustments were ready to go. For your needs it will more than suffice.