I've played all three sets (including the L59 G20 irons you play now).
The Srixon balls with 2 dots of feel worked well for me with the RB irons' fast meter. The meter has to be operating smooth as butter for me to use the Srixon with the R11 irons.
The R11 irons - which I have loved since the day I got 'em - work best for me coupled with a ball that has 3 to 3-1/2 dots of feel. The Nike L81 RZN ball is a dream in all aspects...but 550 credits/sleeve. The L48 Nike XIX is a very, very good ball with the RB & R11 irons. 400 credits/sleeve puts them off your list, however.
I've played six or so practice rounds with the R11 irons using the WGT
B-XD ball. A true bargain at 10 credits/sleeve. I was able to shoot
under par every round, but I'm not capable of threatening 30 without
slowing the meter some.
The length, spin, precision, & forgiveness of the R11 irons are quite remarkable. It's almost embarrassing how good they are compared to all other club sets, RB irons included.That's my experience, for what it's worth.
Good luck to you!