In reply to CebuUp:
In general you need to make sure you're having fun or enjoying what you're doing. If not it will be hard to stick with it. You need to train on it consistently, say every other day, to make decent gains.
You could train either strength or endurance. Although you're more interested in routes, strength is still very important to train to get better. As routes get harder the individual moves get harder too. It's harder and takes longer to get strong but you don't lose it so easily. This what most boards are used for.
So the way to do that is to simply set yourself some boulder problems you can't quite do and keep working on them until you can. Keep a record of the problems in a book so you can go back to them later. As you get stronger these should feel easier than when you first do them. Charting progress like this is a good way to stay motivated and keep pushing yourself.
I don't think I'd put any jugs on 20 degree board. For your ability you probably want more like 1st to 2nd joint flat holds and smaller.
When legendary Scottish climber Malcolm Smith built his first board he found out he couldn't do a single problem on it. He kept working on it though and was soon doing many problems and ended up as one of the strongest climbers in the world.
Post edited at 09:04