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as the car runs on MAP as a control strategy and you'll have a very high idle MAP, this is normal. Speed density on hot cams sucks.
What can you do? Increase idle rpm to like 1.5k.
Or switch to alpha-n using TPS as a load indicator. KPro can do this, but it is not working that well. Alpha-n works best with ITBs, but a plenum is OK, too. Give it a shot.

Your sk2 TB also does not help as these bigger aftermarket TBs let a lot of air pass at already very low throttle openings leading to poor throttle control. On hot cams this comes close to an on-off switch at low rpm. It is also common to see ambient MAP from as litte as 50-60% TPS. Essentially the TB is too big and the last third of the opening has no significant influence on gas flow anymore.
 
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