i use full synth and atm there have been no leaks it always runs sweet as a nut and i think iv got a pretty good engine going off the rr day results but it does use a little bit more oil with it being thinner but nothin drastic
check uv got all the earth cables connected if u leave 1 off it may be making a crap earth through other things but wont take enough current when u need it
check for air leaks when i fitted the schrick it ran like crap until i found the pipe under the induction kit was knackered i temp fixed it with insulation tape now its smooth as a babys bum again