Heyyo,
You could just do...
mp_autobalance 0
and add a lot of bots to the enemy team.
[EDIT]
Yeah, the bots for the moment seem to have a harder time killing at longer ranges.. hopefully we can see some improvements in that area. Storm's been working on this for E[POD]bot, and I hope after more tweaking n' testing it'll be a much damn harder bot even long range.