I recently finished RTK1 and doing the Tae Kim sentences deck, but I'm finding it near impossible sometimes to remember some kanji readings. Especially words with like 4 kanji. I can get down to a handful of cards that are all that remain because I can't remember the readings, and still keep missing them. Should I say the reading and meaning over and over for a minute or what?

Suspend such cards for a while and focus on those that contain 1-2 kanji.
You can always return to them later when you have a better understanding of each kanji that makes up a 4 character compound.

well i have a anki deck called yome and basically i make sure i can read everything i put in that deck but um... i made this deck because i kept forgetting readings of certain kanji since it never shows up that often or is just irregular (ateji) and I already know all the readings of the first 1900 kanji or whatever so i recommend making this kind of deck if you're like at where i am to remember readings of stuff that doesn't show up often.