plumbing won't drain correctly

[uncleof6]

So I was wondering does a drain have to go straight down to carry the most water or does it just need to be slightly angled down. figured I ask before I go down here and trash the setup and try again

You should strive to keep the drain lines angled down at 45° if straight down is not practical. Less can work, but I would keep it better than 15° (you can get 15° fittings from Spears.)