Ask a Bowman Thread.

I'm thinking going single target and train on LHC [...]

Mobbing is the key to level fast, even at LHC where the mobs almost never contain more than 3-4 enemies. Monster park is alot more "mobby" than LHC too, so I'd definetly build for mobbing. Unless you plan on bossing for your EXP, and that would basically mean the ones in Zipangu. The rest of the bosses we have simply aint giving good enough EXP.