This probably doesn’t sound very helpful but… you should just go at the speed you want. Feel like you’re going too slow? Speed up. Too fast? Slow down. If you find there is something you aren’t quite getting or you have forgotten, you can always go back to it, it’s not gonna go away and leave you.

Resources other than TextFugu – Tofugu: 100 Best Japanese Learning Resources
Et voila! :P

As for CoreXK, just wait until you’ve finished all the Seasons – there is plenty of vocab to be learned in TextFugu already (especially these “Ultimate Vocab” lists I’m working through right now) and I think doing both at the same time would be too much, but that’s just me.

If you DO catch up with TextFugu (which you shouldn’t since he is working faster now that he has an employee), check out James Heisig’s Remembering the Kanji – I’ve already explained why it’s awesome in several other RTK threads, so go check there :P