If you don't like the bowl height as a 22", you won't love it on a 26" either. I'd definitely consider raising it. You might be able to get your bracket bolts below the food grate then too and avoid some of the interference I had. The Unknown brackets are meant to be at a 90 degree relationship between the frame tubing and bowl... as you lower the bracket down the bowl, that 90 degree relationship begins to increase by a few degrees, but again, you'd have to really lower it pretty drastically to cause any issues. Even then, it would be easy enough to just tighten everything down on the interior a little bit at a time after the lower frame goes together. The bracket will get tight to the bowl one way or another.
If anything, my complaint on my build would be that the resulting table depth really increased by a lot over the stock table. Mine is practically as deep as it is wide - more like a kitchen island. I'm using the Summit Grilling Center cover on mine, but the fit isn't fantastic, and I think that a shallower frame would have given me more options on the cover. Your idea of raising the bowl by a couple inches or so would allow the frame to be an inch or so less deep also, which would bring down the table depth a bit too.