xud tuning questions.

[pugmanxud]

Hi all a few questions for your about my 1.8t xud 205 which I'm tuning whIle I sort out my 306. Basically I am currently playing about with stage 1 ttuning on my 205. It's running a ko3 turbo and a Lucas pump. Most of the time it will boost fine up to 19ish psi however sometimes it will boost to about 14 and basically drop boost there which is frustrating overtaking things. What is the best way to sap some more go basically!! I'm not running any cooler at the mo but soon to mod my inlet manifold so I can physically plumb one in
any ideas what the dropping boost early problem is?