Of course, how much boost? Are you making over 800hp?
I'll guess 20+ and over 800. You have one of 3 choices IMO - better intercooler (lots of $), E85 or methanol (E85 is difficult to get at consistent % and methanol is $x2), and lastly - meth/water injection (cheap and easy).
I run meth injection. Look at the graph. I came to a stop, let off the brake and went WOT to 3rd gear (street tires.) You can't see the intake temp (MAT) at zero mph, but it was 127. In about 4 seconds it dropped to 83. The meth turns on at 4psi (125kpa) and full on 8 psi (153kpa). You can see it's quite effective.
p.s. - I run 50/50 boost juice at 15 gal/hr and it actually adds fuel. So with the street tires spinning (less engine load) and lower boost (below 12psi) it fattens the AFR somewhat - into the mid to high 10's. If it's not spinning it sits in the low to mid 11's.
EDIT - that screenshot isn't very legible