Hi Simon. Can you explain exactly the two points you are measuring from between the tonehole and pad? For example are you measuring to the outer rim of the pad or the pad seat?Measure them. There are many accepted key heights, but the majority of tenors fall between 8-10mm on the right hand F and 7-8mm on the left hand B. Many horns play great at 7 & 9 respectively. Sand to get rid of the lost motion after the B and F are set up. That's a start, but you can go down a rabbit hole fast
The bell keys you should be able to stick your finger in no problem, this may mess up your pinky stack though and you'd have to bend stuff around.
Best of luck.
Sent from my Pixel 6 using Tapatalk