Adjustment of the BOV has nothing to do with the actual problem. You may adjust the trigger vacuum level on many BOVs; With this ability you may set the BOV to not open unless the vacuum signal is higher than you'll see when coming out of light boost levels. This increases mid-shift response and reduces stalling while coming completely off throttle during light driving... but it's just a band-aid and you're essentially turning off the BOV under those conditions. You'll still have excessive richness when the BOV does open it's just less obvious under casual driving conditions. There's also a performance/power loss because of it which you can only remedy by converting to a different air meter setup, modifying to a blow-through setup (not really an option with a KVAFM system, I'm sorry to say) or by adding a device which will let you tune the fueling to account for the tip-out richness (a fuel controller). There is no cheat, not if you're really looking to get the best performance as possible... Personally, I'd ditch the whistle in favor of performance.
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