Nixspeed

Anyone have one of these? I put one on my Aristo swap and it will not hit a steady boost turned on. In off mode it goes right to WG pressure and holds steady. Otherwise it'll hit 15 then stop to 8 then back to 12. I've tried adjusting all the settings with no change at all. Once in a while it'll hold one boost level then next time I get on it it'll be all over again. All my other turbo cars I run Greddy profec and never had a problem like this.