In thinking about research related to gobbling peaks/lulls and looking back on this years activity, I honestly don't feel like we've had any sort of peak yet (and maybe we won't). I usually see a first peak before the season starts, then it's quieter for a couple of weeks while the hens give me fits, then it picks back up again. Didn't see that at all this year...except for the hens giving me fits part.
There's still plenty of season remaining and looking at my notes from the past, I've killed numerous hard-gobbling birds the last few days of April and first few of May so that's promising.