Heyyo,
Hmm, what maps are you trying that have ladders folo? I've fine tuned many of the ladders, especially on the later levels... so far I've only done the official HL1 SP campaign for svencoop and not anyother maps... so if it's other maps you'll have to get them off the rcbot forums:
http://rcbot.bots-united.com/forums/index.php