I should add the disclaimer that I am a very light rider, I race at about 125 lbs and I run even 23mm tires at about 80f/85r most of the time. Even at pressures that low, I think I'm light enough that I'm not folding the tire much, so I don't detect any difference in cornering precision between wide and skinny rims. You've got, what, 60 lbs on me? At 150% of my weight, you're almost guaranteed to have a profoundly different experience than me. I did try to be specific to my own experience in my earlier comments, I didn't intend them as a recommendation to avoid wide rims.
EDIT: Forgot to add, I have a tube and a Lezyne Pressure Drive in my jersey pocket for every road race I do. This is important anywhere, but especially when I was racing out in Tennessee, if you flat in a RR, you're gonna be waaaaay out in the sticks.