180sx overboosting?

[willie 180sx]

have a hks 2835r turbo on the car and i changed the exhaust housing from a .86 to a .64 and now the car seems to be over boosting lik crazy?could i need to get the .64 housing ported?there a new hks actuator on the turbo to.
any info would be great????

[gem-s13]

the actuator is prob set to short