If it was me I'd leave it be, get it all the way up and start having fun. Don't be alarmed if your numbers change a bit at the final height.Update.
Ok, I got er up on a 16' pole. Came in and checked the swr readings.
Now I have 1.02:1 on ch. 20 and 40 and a 1.18:1 on ch. 1.
I haven't tried to tune the gamma match at all and I don't think I will.
Leave well enough alone right?
Like I said, sometimes we just get lucky.
This is the 3 element yagi beam calculator that I used to get the dimensions for the 3 elements at a center freq. of 27.235.
7 3