Should be easy enough to check for adjustment bolts yourself--have you looked at the slide mechanism?
When you say "not enough space to travel out with the slide" what exactly does that mean--most gaskets/sweeps lean out when coming out and lean in when the slide is going in. If there is good contact across the entire slide top when out, then it should be ok.
This being a '13--have you had it out in a rain event yet?
'16 40QBH Phaeton
'21 Sahara HA toad
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten