At DLV my training tires are 23mm on a 23mm inside width rim. They measure closer to 26mm outside width when mounted. I generally race them at 100-110 psi and have no issues with flex whatsoever. This is what I raced at the last pro race. My race wheels which get used 4 maybe 5 times a year I run whatever tubular I get a good deal on (except gatorskins, worst tubular money can buy IMO) generally 22-23mm width. But my race wheels are also narrow so idk.

The wheels I race on the road are a fat tubular 24.5mm outside width with a 25mm maxxis tubular tire. I'd choose their foot print on any concrete track I've ever raced on especially DLV. I love the feel of them. They roll fast, and the grip is incredible.