Deforming - sure, but I'm not sure to what extent you think it is bad. When cornering hard at low pressure, you should feel the tire grabbing turf or even slipping out slightly, and you will feel the rim moving around a bit - all normal. But if it feels like a flat rear would feel on gentle cornering, where the rim is obviously moving a lot relative to the tire, then you probably don't have a high quality rim-tire combo if indeed you have 30psi in a 33c wide tire. When running tubeless I am at 24/26 front/rear and I weigh 155. 30-35 would feel rock hard and would be slower on bumpy ground. Pros running tubeless clinchers are in my ballpark, definitely lower if they are smaller than me. But they have high quality tubeless setups (where the bead pops on with a loud snap as you inflate them). Occasionally I've had to stick a tube into my tubleless setup, I keep it at 26 and don't worry about pinch flats - its just a race.