he351ve's are variable vane.. i set the vanes to when i wanted it to spool.. i have it set to where i see boost at 2800 rpm.. i just opened it all the way and slowly closed them more and more each pass i made in the car.. then once i liked where the boost start point was.. i marked it and tack welded it in place... i am now using a 46mm external wastegate to control the boost and an electronic boost controller that controlls boost per gear.. in 1st or in launch mode.. i hit 4.5 psi then in second and throughout its at 10 psi.. or it works great just off of the wastegate as well... you can do what i did.. find your sweet spot,tack it there, and control the boost externally and it wont fall off, and will keep power throught the whole rpm range.. thats why a large external gate is beautiful on these turbos..