Vinnie Paul never used a 26x26. Biggest he went was 24x24. Everything in his kit is squared. 24x24 kicks, 14x14 and 15x15 up top, and 16x16 and 18x18 on the floor. "His" sound was produced by a combo of wooden beaters and Danmar single click pads, and 2 mic positions, one inside, one on the batter side to capture the "click" of the wood beaters against the pads. Vinnie is my idol, and my main influence, so I apologize if that seemed defensive lol...
I personally own a 24x16 bass drum, with 3 up, one down, and I have had problems with tom mounting. I run a 13x9, 14x10 and 15x12 up top, but I have been configuring my kit since the day I got it. Im never satisfied with the positioning of my tops up top. Now, I have the 13 and 14 on a separate stand my 15 on the right side of the mount on top of the bass, with a 9.5 Zilbel on the left, then my mounted 16x14 floor on my right under my ride, and I am having notions of moving everything around again. I do love the fact that my 24 incher can sound nice and boomy, or nice and punchy. I also have a tone control inside of it that I adjust the amount of boom or punch hehehe....
Vinnie Paul used 26x26 before he went to 24x24. The Remo kits had the 26x26's.
He had a couple pretty cool Remo kits. Google for pics of them.
He may have had a 26x26 on the first Pearl kit too, but he had a couple kits with 24x24's with Pearl before he went with Ddrum. he was using their triggers for years, so when guys started going to ddrum, I wasn't shocked, but kinda surprised because he was with Pearl for quite a while.
Big, square toms with every brand he's used though, and the 8" deep snare has been consistent as well.
You have some depth on those toms. Good luck with that.
Really great sounding sizes, but when I ran 3 on top (a long time ago), I had a 10-12-13 (trad depths) over a 24, sometimes 2 24's.
I also had 12-13 power toms over the 2 24's. That was high, not
too bad, but also not 12" depth like a 15 has (
plus trying not to have the tom scrape the bass drum!..esh!!).
Since you are playing with positioning, what about the 13 up top, the 14 on the left side by the hats, then a 15-16 "2 down" positioning?
Or, 13 up top, 15 hat side, 14-16 "2 down". The 16 is a 14x16 so it should still sound cool with a 10x14.
The 15 on the left will also let you do some "big" sounding fills without having to reach up, just over with your hand.
A tom or floor tom in this position works really great. It gives you lots of options, as far as how fills can sound, without taking up any more space, or having to reach all over the place.
Good luck!