I really would love to try one of those Martelli cutters. I have wrist issues after only two years of cutting! Owie! Doc says don't use a rotary cutter for six weeks. Right...
All I can recommend is to change your blade often. I know they're costly, but if you're putting stress on your hand or wrist it's not worth saving and using those old blades. Go buy a supply of rotary blades and always change your blade if it's not slicing through fabric like the fabric is butter. It's not worth a wrist injury or being sidelined for six weeks.