boost hesitation

Hi guys. Got myself a new HKS actuator past week. Installed it as per to the given instructions. Set it to 123mm (0.8 bar) below fuel cut. Car boosts at 9psi 1st gear. 2nd gear 10-11psi but around 6k rpm the car just lets go for a split second feels like hitting the rev limiter once. Happens on...

mods, this is a little bit of a mix between several categories of what could be wrong so please feel free to relocate it appropriately if necessary. so here's the scenario: cruising down open road (a pretty long stretch) and was granny shifting all the way to 5th.. then i let boost kick in...