50 slots @ 100 tick? I've heard that using 100 tick with a lot of slots can get buggy (though I don't know if that's true or not, maybe someone else can confirm?).
Either way, these rate settings should be fine for any 100 tick CS:S server:
Code:
sv_minrate 13000
sv_maxrate 30000
sv_minupdaterate 66
sv_maxupdaterate 100
sv_mincmdrate 66
sv_maxcmdrate 100