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Sure, we're glad to help. *ahem* I always try to read before I mod... lol. anyhow, trial and error does work, but moar boost can lead to moar engine replacement, etc. etc.
Also, can you space your posts out a little more? It's a little hard to read, but anyway.
It's good that you have the sensor installed inline with the filter - it's the Air Mass Meter (AMM). I'm not sure if bosch/regina matters or applies, but I think the BOV will screw with the mixture. Basically the Bosch setup expects a closed system from the sensor to the throttle plate and a BOV opens it up. I dunno how it would actually work out to have both in place....
Okay, is this black knob attached to the throttle body and throttle plate?
Does it have a flat spot for a wrench in the middle, a plastic ball joint on each end, and a lock nut for each end?
If that's it, it's a link between the throttle spring setup and the actual throttle plate (anyone, feel free to correct me, I'm only about 70% sure that's the exact function, I haven't looked at it for a while). Adjusting it may adjust your idle (or not - the idle system may be able to compensate, depending on how far it can be adjusted and if the idle system works). I believe it adjusts where wide open throttle on the spool relates to the actual throttle bein wide open or slightly closed, etc.
So, if you make it really short, it may make the throttle plate only open 80% at wide open throttle. (I believe that once you're past about 1/2 way open, it's less and less important how far open the throttle actually is.)
Anyway, keep them coming, I'll be back tomorrow. You can adjust the link a few ways, but maybe someone else can chime in. I think both ends have the same threads, so tightening the middle might do nothing... then again it's 2 am (1 am with daylight savings time switch).
Night,
Will
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1990 740 Turbo, on its way to stock specs, maybe beyond
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what turbo do I have [700][1985]