Ok after just spending an hour waiting in Aby Mis for bastion to start and then during the course of the 45 second battle I got a grand total of 51 credits. I'm trying to do them as whm, I diaga'd everything as it came in, kept stuff away from the martello and just stayed alive as I've read is the best way to approach this as whm. Wtf am I doing wrong? I need 1000 points to get my pants and after 4 hours of this crap filled event I have 100 credits to show for it.
Is there some easier way to get these credits that I'm not finding, or am i doing it wrong?
You are not wrong. It is the best way for a WHM to get credits. However, it's fully dependant on other people participating. You basicly get yourself on the reward list by casting a single Diaga. Then you need other people to actually participate in the whole event and kill stuff. Everyone who participated on a monster's demise earns roughly 1000+ credits.
If you have it, BLU can sleepga and then destroy them one by one, or AoE them. BLM can ES Sleepga II and go to town. Even a crazy eva'd THF would come in handy. But there's simply no way you'd be able to kill anything on WHM for points solo.