u do nnot want to run it of the manifold. the manifold provides boost and vacum, that is something to hook up ur boost gauge and blow off valve up to. for ur waste gate actuator, u want to hook it into something that is just boost with no vacum. what i do with mine, is on the silicone hose coupler that is used for clamping my intercooler piping to my turbo, i put a small hole in it and stuck a nipple through there, i use that to run a hose to my wastegate actuator. here is the link
http://www.frsport.com/Turbo-Q....html
but i have heard that vacuum can ruin ur wastgate actuator though.
as for the turbo and the oil line restrictor, that all depends on the turbo and im no turbo tech. i havde heard from many that ball bearing turbos require a restrictor, but people also say that it is important to use the right restrictor size, not just the smalles one u have. ur gonna need to do some serious research on that to make sure u have u oil lines done right. whether or not that is the problem here, its not something u want to be done wrong.
good luck