In reply to rock_fodder:
Here's an idea, try to climb a steep 6a without bending your elbows. Seriously, if your elbow bends beyond about 10 degrees from straight, start again.
Think about your feet positions, how high they need to be, where in relation to your body they should be to propel you to the next hold, then use your core and the flexibility available in your shoulders to get your hand up to the next hold without just cranking in and bending the elbows to get yourself higher. Think about momentum too, use one hand as a pivot, push with your legs to swing yourself on a straight arm towards a hold, this directly uses the power in your legs (of which you have more than enough) instead of in your arms to move you up the wall.
Google 'drop knees' or 'egyptians' and 'step-throughs'.
This will be a much more rewarding use of your time, and should really make you think about the most efficient way to move between holds, a skill which works at every grade.
More efficient movement means less energy used which means you can climb further or harder, without a sniff of a fingerboard. plus you get to climb instead of dangling from a bit of wood...
EDIT: I should add that I have a fingerboard (2 in fact) but I spend more time doing easy footwork drills than I do hanging from my fingertips, practice what you preach and all that.
Post edited at 14:00