Lemain, you've clearly misunderstood some of the quotes you've used and are now guilty of completely muddying the waters.
Drop the reference to 'how can he make a mistake - he's got 14,000hrs'. How many hours had Hanna, Proudfoot, Girdler, Bullock, Guy B-W.....got?
The static system does not need to be leak checked before every flight. You are misunderstanding an ex-Bosconmbe engineer who stated the system was checked prior to ETPS inverted spinning exercises. How can you possible believe that you should do a leak check prior to every flight??
The T7's LH altimeter is not a servo altimeter when used in Sby mode. The RH altimeter is the servo which can feed more accurate data to the LH alt when the latter has been 'reset'.
If the static piping in the wing was leaking as you suggest then you'd get huge changes in 'static' pressure as the wing was loaded and then unloaded. Any pitch change would cause a very noticeable movement of the altimeter and a smaller jump on the ASI.
The slight lag on the LH altimeter would mean it's pointer was still increasing as the Hunter reached the geometric apex. For LL aeros the altimeter is scanned during the 2nd quarter of a loop, not a photographic snapshot at the apex.
As already highlighted, there is a very noticeable difference in the 'picture' out of the window between 2700ft and 3700ft. You don't need a pointer on a dial to tell you which is which.