Originally Posted by DaveSSS

AFAIK, all brands have short cage RDs that will handle a 50/34 with the largest cog or largest range road cassette that they sell. The 52/39 crank reduced your wrap by 3 teeth, compared to the 50/34.

If you tightened the RD cable too much, of course loosen it until the shifts all work correctly. Tightening the cable makes the RD move further to the left (toward the larger cogs). You've probably got the cabel so tight that you're half way over to the next larger cog.

As for the change you made, using a 52T big ring instead of a 50 is only half a cog's worth of gearing (4%), so it won't make much difference, unless you were constantly needing something lower than the 50/24. The 39T little ring will make a bigger difference. The 39/15 is like your old 34/13.