chasers hardly get accepted at all. best bet is to join a guild that runs bio4 parties frequently, otherwise you'll have to be really aggressive about getting a party (or you can just make your own one).
if you want to solo level, you can try some of the new world boards. i've seen some shadow spell chasers leveling on bradium golems before.
aspd is going to be your main focus so get it as high as possible. if you can't get 193 you can use a drooping alicel doll to proc max aspd, or a musketeer hat for the adrenaline rush (do these exist on thor?)