I'm about 100p off the top score in RD. Get your 4x combo early and then focus on blasting stuff as it spawns. Whenever something spawns on the third row, launch a shuttle as you fire, you'll clear the ship and pick up bonus points. Honestly it's a concentration game.
Shattered Eezo is simple, just block till they do a charge punch, then smack them while they're charging up, when they go back to punches, block again. 1500 racked up doing that.