Firstly, lats are only ancilliary muscles in the deadlift, although i keep them tensed for the whole ROM cause it makes me feel more 'supported' as far as my spinal errectors go. Helps me keep the arch.
Secondly, what's your biceps "Problem"?
Are you progressing on your pulldowns/chins?
are you progressing on your rows?
if so, where's the problem? If it's size you're concerned about, just continue going from rowing progression - if your pulling movements are progressing then your biceps will be. Remember, big arms belong to big guys.
I'd never suggest doing biceps before back. That would just take any from my back workout.
If they're lagging then maybe they aren;t getting enough rest, so doing them after back, once a week seems like a good idea. What is your current biceps routine? (Back routine also)
After rows all you need is like 2 sets of curls to do the job. After rowing and what-not your biceps are already screwed and just need some curls to finish them off.