this might sound stupid but can you hear the cams at idle? And how's the low end torque?

 

I have the same cam combination as you and I am very happy, the car is pulling strong.
I tested my car against my friend 911TT and we had the same acceleration!!! (I was on race gas though...)
The only difference was after 4th gear, at that time he was faster than me.
I will try the combination 272in/264ex, it looks like I will be able to accelerate faster at higher rpms.

 

what do they sound like?

 

I had a problem with idel until I got the aem but with a SAFC you can play with the fuel it might help.

 

sounds from the cams it self ? If so, you can barely hear it. but exhaust wise, it sounds like baby 5.0 mustang

just my .02