I know exactly what boost creep is, but not because all my friends use deltagates.

Go here http://www.boostvalve.com/tech/TECII.html and look where it says "boost level". This is a deltagate running about 16psi on a 6psi spring (using the boost valve from the site), those fluctuations you see are far less than any humanly perceptable level, and are rock steady despite shifting and such.

Oh and BTW, check out the MAT (manifold air temp) going down throughout the run. This car doesn't use an intercooler, just alky injection which we all know doesn't work worth a squat