Edit: With 20 blades skill and now 6 dodge, what should I hunt? Zombies really don't give much experience, and they aren't much of a threat except for zombie rot. I'm sick of hunting chobos, though they give decent exp I think I've killed a couple hundred of them. The only other things I know of are in the mines.
Arachnos start getting possible at 20 blades. Be careful and carry lots of healing items.
To get to them, go one tile west from the manhole south of the bradbury and straight north until you hit the bug tube. You'll need to kill the bug queen to get in, which can be slightly difficult. She doesn't tend to do much damage but she soaks a lot and she is able to eat you if you don't finish her off fast enough. Should she decide to eat you, either use writhing smoke or smoke a cigarette and she'll vomit you up. From there head west* and down and you'll be in the subsewers**, where the arachnos are.
Also, the contract can be bought from that place that sells contracts in slagtown (not the zombie hunter place, the other one. Forget the name of it. It's KH or something on the map.) and they pay out $500 a piece.
Also, is that 6 total dodge or raw? If it's total, that's pretty bad. I'd invest in some good armor***. seems your reflex should be high enough to make your dodge decent if you're using blades. I'd suggest gymming it a bit. It's a useful stat to get to 18.
*The room to the west has a nest which regularly spawns bug eggs while the queen is still alive. They each weigh 5kg but can be sold to Avram (SU) for $700 a piece, which is a nice way to make a little extra cash.
**Be sure to wear a gas mask while down here as the pustule will give you jointrot without one (or hyperimmune which it sounds like you don't have yet as you mentioned zombie rot).
***You can get a free cage jacket from one of the shadows in gangland. Keep killing them until you find one with it. I'm not sure where cage pants spawn but I'm pretty sure they exist. Cage protects well against slash and stab, so it's perfect again arachnos.