Camaro goes redneck! plus a question..?

[MaxHarvard]

I bought these slicks off Camaroboy69 on the board here. I figured, i'm bored i'll throw them on! LOL

My question is... i went for test drive, 2 things i noticed. The car bounced a lot. Tires have 20 psi per side.

2nd question... it feels slower than with the smaller 275/40r17's i have. The tire now is a 28x11 Hoosier quick time pro. Now, admittedly it is kinda humid today, but it felt much much slower than just weather stuff. Any idea why it feels slower? The RPM's dont shoot straight up like they did with the old tires.