I struggle to get SP... badly.
I have a 23 MRD. I have an R20 axe. The next Axe is an R30 one. I generally get 50-150 SP a kill. The mode is closer to 80SP a kill. Once in a blue moon I'll break 200SP. Fights are generally about 45 seconds. In those same 45 seconds the THM, GLA and PUG I group with will get 200-300 SP. So while I'm doing ~3300 SP/hr they're in the 4-5000 SP/hr range. Their ranks are comparable to mine. We've been doing ants in Copperbell mines.
My R23 GLA friend said that he was having the same problem as me, until he switched a to R38 Sword.
Has anyone else noticed using a weapon out ranking them delivering better statistics or does MRD just suck narly nuts for SP?