Paul for a boosted setup these electric vac pumps are awesome. I've been running the cobra pump for like 3 years and it solved alot of issues. Also seen these pumps clear up blow by smoke and oil leak issues.
I can think of more then a few v-8 power adder guys here locally that we have talked into going this route and it has worked perfectly everytime.

 

It pulls some out, but when the hot oil vapors cool in the intercooler is when the oil start to collect. A seperator doesnt catch that. If its works for you great! But I can guaratee that if you pull up pipe to throttle body there is always oil residue there.