Thumps..
here's a Holset turbo FAQ from Dodge..
http://dodgeram.org/tech/dsl/FAQ/turbo_faq.htm
boost creep is so hard to fix.. with an internal gate..
other than porting the hole, maybe upgrading the wastegate puck.. i dunno
CREEP is when the turbo produces soo much air, even with the wastegate fully open, it still creates backpressure and spools the turbo more than you wish.
# Normal boost rise when set to 13 psi = shoots up to 14, then 13, 13, 13...
# Spiking = shoots up to 16, then 15, 14, 13, 13, 13...
# Boost creep = shoots up to 14, then 13, 13, 14, 15, 16, 17...
# Spiking and boost creep = shoots up to 16, then 15, 14, 13, 14, 15, 16,17...