Actually I am only shooting for MAX R12 capability.... I have my system apart.. thus would not want to miss an opportunity to upgrade... I am in a HOT and HUMID area... my motto is " you can't get the inside of my car too cold ".....
The newer condensers are not expensive.... less than $100 for the one which will fit my 240....

Jim, that was my feelings on doubling the Reciever/dryers...more total CC's inside the system... not colder.. but more RESERVE before not blowing cold...

Maybe your car needs a larger ( 10 percent ? 15 percent?) crank ac pully circumference... so that it does not disappoint at an idle...
Don't know how hard that would be to find or make.... but seems the direct fix..... on the other side of the equation... it might cause the compressor to average less time on... but cycle more often... but not enough to matter with regards to clutch wear .(IMO)....