I don't reckon you need beads at all personally. Sometimes, very occasionally, I do use 1 bead if I find the hooks sticking together, but certainly not 3.
3 beads would restrict your flick of the tail Andrew, as you have to be vigorous with your flicks of the rod to get the best out of the lure. I flick my prawnys hard as does Keith.
With 3 beads in the tail it wont let you do that, but I've heard you are not a hard flicker of the prawny, so that might work ok for you.
I also use red nail polish to paint small sinkers and occasionally use that as a bead when current is super strong. Little bit of extra weight.
Other modifications I do is swapping the belly treble over to a size 4, 6X VMC whilst leaving the tail treble as is as most hookups are on the belly hook.