i'm about 4-5 weeks ahead of you with my printer..
i used repg for about a day, then switched to slic3r and finally to simplify3d.
at first i though slic3r was better, but i stuck with using s3d and my prints are turning out great.
i would suggest you just stick with it..very few people don't rave about it.

my suggestions.
get some glass
use hairspray
pull that blue tape off your build plate.
for thinner walls, print more infill. try 30-40%
In s3d and slic3r there is a "detect thin walls" setting.
not sure about repg