I've felt of late that my rock climbing has somewhat plateaued. I seem to be stuck at around V4 bouldering and 6(b) rope climbing. I'm pushing my grade as best as I can but simply climbing doesn't seem to be generating the results I want any more. I've not pushed passt V4-5 for a number of years now. Sometimes, if I can't go climbing for some times, it drops but then I'll start making gains again and hit the same plateau.
I think my technique is good. I always just either can't hold a crimp for long enough or run out of stamina. At the moment I don't train (at all really), I just climb. I do circuit training once a week, indoor climbing once a week and get outdoors as much of the weekend that I can. I'm pretty busy with my work life, etc. and can't really devote any more time to climbing.
I've started doing dead hands (hanging statically from training aids until your grip fails) to improve my grip strength. My climbing gym has installed a series of campus boards and beastmakers, etc.
Can anyone suggest any good training systems to improve my climbing? Grip strength, endurance, etc.