I have a pair of Mainlink XL's that fit great and I'm wondering if anyone can suggest other frames that have similar fits. Specifically, I'm looking for something a little more suitable for running and biking, and with more lens options than the Mainlink XL offers. I've tried the Flak 2.0 XLs and found them to be uncomfortable to wear for long periods of time because they were squeezing the sides of my head. I'd appreciate any suggestions, thanks!