In reply to littlejon86:
I know exactly what you mean. Something I was wondering about over the winter too. A really full pump can take a long while to fully subside. If you don't rest long enough your standard is way diminished. That's why people rest for up to an hour between tries on hard redpoints when climbing outdoors. But of course you don't want to take rests like that when training.
One solution is to just do easier routes so you're not so pumped each time. But I think that just gets you fitter for doing longer routes of a low standard and doesn't do much for power/power endurance needed on harder routes.
I started experimenting this year by deliberately taking rests/hangs on harder routes before I became overly pumped. That way I could do the same hard pitch multiple times in a session with relatively short rests (just the time alternating leads with my partner - 10 - 15 mins). This is like interval training. Because you're not focused on getting to the top you can focus more on movement, experimenting with subtle shifts of body position and executing each move as perfectly as you can.
But the main thing is that you can greatly increase the volume of hard moves you do in a session. You can also gradually decrease the number rests on a route you take to increase the intensity as you get stronger/fitter.