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It doesn't sound all that out of the ordinary to me. If you're only using 25% throttle, there's no need to build boost to provide extra acceleration so the ECM leaves the wastegate open for better efficiency. The Valvetronic variable valve actuation system on the N55 can also be used to control the airflow (and resulting boost pressure) through the engine by adjusting valve lift and duration. What happens at 50% or 75% throttle? I'd imagine you'll build some boost but not the full 7-10 psi.
I'm tuned with MHD, but I'll try to log some runs on my way home today at 25%, 50%, 75%, and 100% throttle to see what the target and actual boost pressure are for each. Hell, I guess I could flash back to stage 0 and see what the stock commanded values are...
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser
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