1000 Yard front sight base and rifle Update

I shot the Bob Wright memorial 1000 yard match with my new 6.5/06 rifle last weekend, 3-20 shot matches and I put about 84 rounds downrange using unlimited sighters in the 1st and 3rd matches, had some issues getting on target to start with. The front sight base worked very well. didn't budge, did not get loose, nothing! stayed right where it needed to be.

Being that this is the 1st time I've had to fuss with getting MY OWN rifle on at 1000 yards with iron sights I had made a thermometer target and shot it at 100 yards to zero. The only issue I think I ran into however is my home range shoots a bit downhill and Camp Perry is near level I think. Everybody said I needed to zero 27 MOA high to be on at 1000. Later on the ballistics program I ran some numbers on after finally getting the chrono to catch the bullet and not the bits of grass or my muzzle blast said 32 MOA was what I needed.....The ballistics program was correct and when I came off the line having just finished with a pair of X's I had exactly 32 minutes on my rifle (128 Clicks). But when I shot on my home range to confirm this I was still only 27 MOA high?  and the two shots I fired at the thermometer target were touching and 7 inches out to the right (that was my wind correction from the last match and I hadn't returned it back to mechanical until I shot on the thermometer target) So I'm still doing a little head scratching there.   Soooooo I'm not really sure where my 5 MOA went to at this point in time, May re-fire the target again and see if I was just holding different that day. I hung the target with a plumb bob so that wasn't the issue....only other thing I could think of is the cold bore shots vs very hot bore shots....but 5 MOA???  the aiming black is 4.4" at 100 and 44" at 1000...hmmmm

Anyways my scores were pretty good I shot a 188-3X, 182-2X and a 176-1X I had some position problems and stock/cheek weld problems which resulted in a nasty abrasion on my cheek.