zombie spawn time on some maps

is there any way you guys could have zombies spawn at an earlier time on these maps? (for the escape server)

forgotten facility
rollermine factory
cp escape
titanic escape
paradise escape
icecave escape
phantasy escape
mytex escape
blackmesa escape
raccoon facility

zombies need to spawn earlier on these maps because they ussually wont even catch up to the humans till the last stand part of the map (or sometimes they dont catch up at all) making these maps WAY to easy for humans and unfair for zombies.

and those too.

oh and stargate escape

The most important map is ze_sg1_missions_v2 which is a cool map but sometimes zombies spawn way to fast and are teleported in the same place with the humans where humans are not able to make their way through the zombies and the whole thing become so annoying.

I am ok too with the other maps except POTC where zombies can jump in canyon and get teleported in cage where are all the humans who fell from the brige,this could be a big fail for humans and can decide the round.
Ah and forgotten facility where most of the time zombie wins,no it depend about their skills.

I just lowered the zombie spawn time globally by 3-5 seconds and increased ze_sg1_missions_v2's spawn time.

I also decreased the spawn time for the said maps by around ~10-12 seconds. Please advise as to how these changes work out.

hmm it doesnt seem like any of the spawn times have changed