+1 for shortening up the distance from the release to the flasher!
I also like to run a short (12-18") piece of 40lb test line in front of my flasher..... Basically if you can imagine it; 25lb mainline --> 6-bead chain swivel --> 12"-18" 40lb line--> 6-bead chain swivel --> flasher etc. etc.
If you watch a flasher in the water, it doesn't rotate directly at the swivel. It actually makes a pretty large diameter roll. So the area of your line where the actual twist occurs is quite a ways up from the swivels at the end of your line. I find running this "Pivot Leader" gives your flasher a "pivot point" where it can rotate and I have found it puts A LOT less twist in my lines.
Word of advice: Don't make this piece too long. If you do, you're going to have a heck of a time netting your fish by yourself.
You can also take off your flasher leaving just your 10mm bead and swivel on your line and strip off about 100ft or so of line while your boat is underway. This will let the twist built up in your line twist itself out, then you can wind your line back in. This'll also relieve a lot of the pressure on your mono which is a good thing too. "You know, get two birds stoned at once."