Guys, I must admit I this thread was a mistake. Thank you for all your input. I apologize much for wasting your time!
I didn't do my due diligence and jumped to conclusions. I relied on memory and didn't load up all my old logs. I used one perhaps too optimistic log as a reference.
Anyway, loading up a bunch of logs, sorting and discarding based on shape and deviating number in either direction I came up with this. Admittedly it's biased towards the better numbers - but hey that what the pros do too
So in reality, I may be around 175-177 hp now vs. 168-170 before. More important than the actual number, this gap is present in the whole curve now. So I'm more inclined now to go through the hassle of keeping it.
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Originally Posted by solidONE
You could try making it run a bit leaner and see if you can get a few more ponies from that. The OFH ignition advance is already pretty aggressive, though you could try adding ignition advance incrementally where there is no knock corrections.
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It's already running pretty lean at 11.7 and there is already some slight FLKC, so I don't think it will be more headache that gain going in that direction. Also, this needs to be a track capable tune.
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The tire size you inputted will have an effect on the Vdyno calculations and total weight to a lesser extent. The numbers might be slightly off between different wheel/tire setups, so that might have thrown your numbers off a little. Though 174Hp with a stg1 tune and stock header is pretty impressive. It's quite possible that the stg.1 pull you did was reading high. Good luck. 
For your reference, my stg 1 tune got me about 165-168hp on 91 fuel. Stg 2 with Tomei EL my pulls were getting between 178-181hp pretty consistently.
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Yes, the above now better match those numbers. I'll do some more runs at different temperatures later on, maybe the compensations cause deviations too. Best thing would be a pull at 20 deg C and with the other wheels.