I play with Babolat Tonic + 15L at 54 lbs on the mains and Babolat RPM Team on the crosses at 52 lbs and play 2-3 times a week for about one and a half to two hours each session and it takes about 4-6 weeks before the strings stop snapping back into place and I restring.
I personally don't feel B5E is easy on the arm. I used to play it in the crosses with gut mains and and tried it as a full bed at 47 lbs and it felt harsh to me compared to RPM Blast/Team strung as a full bed at the same tension.
(4) Volkl PB 10 Mids
Babolat Tonic+ 16/Babolat RPM Team 17 @ 51 lbs