Im 6'4 like you, and have larger hands...and like you I started with rocs and moved to the buzzz for the same reason. I also got a hornet because it has a very similar feel, if you havent tried the hornet yet, I would definately recommend it. I recently transitioned to the Truth. It has a wider rim, but is shallower than the buzzz. It felt slightly odd on first impression because I got so use to my buzzzes, but after one round, I loved the feel of this disc. I throw a fan grip with everything under a fairway, and this disc fits the fan nicely. The disc im going to most recommend to you though, is the verdict. The verdict is slightly OS, has a straight flight path with great glide before a very dependable fade. It has a deeper rim than the truth, and feels very similar to the buzzz in the hand with a slightly wider rim. Over the years of playing, the verdict is the only real mid that when I held it, it felt "right", and I didnt have to "get use to anything". They have lucid proto verdicts on DGC right now for 14.99 I
Edit: ive never tried one, but theTrident has a wide rim on it, not sure on the depth...feldberg loves em...anyways...
Good luck and welcome to DGCR!