You say you don’t want have the time or privacy to jelq, but wouldn’t pumping be worse in that regards? It’d be pretty hard to conceal a pump in a hurry I would think. From everything I’ve read, if you’re getting gains, even if they are coming slowly, then you should just keep at the routine you’ve been doing. And if the gains stop, then add a few exercises or reps to the routine to increase the stresses slowly.
Began June 2013: 7" BPEL, 5.3" MEG Current: 7.4" BPEL