In reply to on a far off mountain:
I'd definitely get some structure to your sessions at the wall. If you feel that the movement's not there then I wouldn't bother with strength training at the wall - a bit at home can't hurt, but it's not a good use of time at the wall if you're not climbing with great technique.
If it was me, I'd make sure that I got *a lot* of volume in at the wall. Maybe spend 45mins warming up, climbing problems from the very easiest upwards with impeccable technique focusing on each foot placement being accurate (silent feet) and every body position, really exaggerating the straight arms/twist in positions on steep ground. Every problem should be made as 'unstrenuous' as possible. Downclimb everything, slowly. After 45mins of this, you should be really well warmed up and climbing somewhere towards your onsight limit (depending on how much there is to do at your wall!).
Then get on to problems at your limit, finding something that will go, but not yet. Have really good attempts with enough rest in between - i.e. really try to climb something hard. After an hour of this you should be done (even if you don't finish anything, you might do next session), after a little warm-down/stretch. That should be a pretty productive session.
If you train like that twice per week, you should definitely improve. It'll do an awful lot more for your climbing than finger-boarding and pull-ups.
Bear in mind that it is really hard to train stamina in the bouldering wall. Circuits tend to be too hard and are more like power-endurance. If you want to get fit for long trad routes, you'll need to train on routes (lots of'em, in blocks). But if you're heading for the grit, bouldering is better training, since the routes tend to just involve a couple of hard moves between ledges.
Post edited at 13:21