I played with a full bed of X-1 Biphase 17g @ 57lbs for quite a while and didn't have the power or spin I liked. It was arm friendly, but I just didn't feel like I was getting what I needed out of it.
I recently tried a hybrid set up with X-1 Biphase 17g in the mains and Lux ALU Power Rough in the crosses both at 54lbs. It was a little rough on my arm at first, but once I slowed my swing speed down a little the string took care of the rest. Power and spin have returned and my arm is happy (for now).
Not sure if this will work for you, but it was successful for me.
Whiskey drinker with a tennis problem....