Sounds like the throttle blade isn't open enough. Mine would sit at 50% to with how I used to set idle. Just remember to give it a second to settle after making the adjustment. It'll raise up then settle back down to commanded idle.
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After I got home from work I fired up live link and I noticed that I was not even logging isc duty cycle. Pretty sure I found the parameter so I can log it going forward. I turned the tb stop screw 1 turn in / open and readjusted the tps sensor to bring it back down to .99 volts. In sct I added 5% to the isc air flow neutral table. I can't fire up the car tonight the little one is sleeping. So tomorrow l'll warm up the car and make the final adjustment on the tb blade to get it to around 35% duty cycle. Hopefully that takes care of the surging idle and I can get back to dialing in my maf curve.