In reply to Fortran:
I see no reason why you can't take it further than V6 if you really really tried hard. The fact that you are onsighting V4 and projecting V5 after only a year is commendable.
25 pull ups and a one armer is crazy strong upper body. I project around V7 (working on V8 now..) and doubt I could pull out 25 pull ups and a true one armer without a bit of momentum from the ground.
Is this indoors/outdoors? Chances are if you have just started that fingers and technique might be your weak link. I'd do plenty of fingery bouldering allowing plenty of rest days in between. I'd also have an easy session (easy meaning V4 max) a week with lots of volume for endurance and recovery.
I think it might be an interesting experiment for you to see how far you can push it :p Go for it!