I switched to Hyper G 2 months ago and for the past 1 week, I have been experiencing arm issues. I have a few friends who have had the same issue. What is a similar string to it but is more comfortable.
Yeah give Hyper G Soft a try in the 18 gauge. Was going to say if you haven't tried regular Hyper g 18 to give it a shot, as it's very soft for me. I've only used 17 gauge of Hyper G Soft (in my own rackets I'm familiar with) but found it to feel crisper and wasn't substantially softer than the regular G. The 18 gauge of Hyper G soft may be an easy first try since Hyper G soft is pretty close to hyper g performance wise, though I think the difference between hyper g and hyper g soft in terms of comfort is more minimal as you get into the thinner gauges.I use 18 gauge.
I'd recommend using full beds of synthetic gut - moderate softness, but a little more backbone than multifiber - until everything feels okay. Then see if you can tolerate playing with either that light gauge of Hyper G or another skinny poly in a hybrid. I've had a few locals switch into Isospeed Baseline (full beds in some cases, hybrids in a couple others) from RPM Blast and Hyper G when those polys apparently gave them too much arm pain or numbness. Even if you chew through syn. gut rather quickly, it's pretty affordable string.I use 18 gauge.