What length lines are you using??
I think you will probably find that most sailors these days are using a lot longer lines than the old days. If you are using really short lines like 20-24" then you will struggle!!!!
Personally I use 30-32" lines for slalom/speed blasting and 28" for freeride or waves.
Hook up or down shouldnt really make a difference as both have their pro's and con's.
I sail hook up as thats just the way my first harness was when I bought it and I didnt know any better. definitely in the minority though

Ask the sailors around you to check your gear or for advice.