Yes I'm sure it was he , who put that slug in yours as well. I can certainly get in touch with him and pass on the info if you like Gremlin. With this first run of pistons .. four in total, minimum order. We just wanted to get a feel for how it is. Then if it's good ? And it sure seems to be so far. We will order another run of them provided there is enough interest.
And yes, I am sure it is fine with the stock ECU. We found the same with a much higher compression increase. And I would imagine your TPS might have been bumped up a wee bit ? The only point in which we needed to use a PC-V, was when we went to Cams and to increase the rev limiter.... A must really. The Cams make too radical of a change. Radically pulling fuel out down low, then radically adding fuel as the revs come up as you could imagine with more lift and duration. But prior to that ? Not an issue with the stock EFI and TPS adjustment. The first time we put a PC-V on before the cams.... It made a 1 HP difference and slightly better throttle responce. The bike had a freer flowing filter and silencer on it at the time , with the much higher compression of the different .... smaller.... chambered head we were using. And have been using up to now. So, prior to the tune on the PC-V we were fine with our AFR's.
Now with the tune on the PC-V ? And remember, the bike is set up the same except for the head and piston. It "feels " fine. Plug looks perfect. I am not concerned, It may need a tweak ? And I intend to get it on a Dyno to take a look at it and see how it does, but I want to break it in first and get a better feel for it on the road first. I have played with the fuel a bit at idle. But I'm back to where I was and it's fine. I started with a colder plug... an 8.... for safety with the higher compression, and I'm moving the heat range hotter. I'm at a 7 now and it is good. But I intend to try a 6 today. This stock chamber, because it is larger then what we have been using seems.... Lazy-er at low speeds as far as the mix. But may flow better at higher speeds. So it seems to react better at idle with a hotter plug.