Suggest you move the PS3 out too. I got the old thick version of PS3 like you do.
I had 6" top clearance and added 1" ground clearance and 6+" right & left clearance for PS3 in my cabinet and I still have to turn on the AC when I play with it or it will crashed after 30 minutes of gameplay.
Also my Squeezebox next to PS3 vent is very hot, I think I can bake a cake with the hot air coming out of PS3 vent.