Hello Antoine - a while back I was testing Krsky1's world wide airports in Rob Corn's NZ Coromandel scenery (btw, that is not generally available). Some of them were out of place, so I fixed that, but I found that if I started the Beech76 cold and dark on a parking position, it sat down nicely with the chocks and tiedowns. If I started it on the threshold, ready for t/off it was about 30cm above ground level.
I like to land/ take-off 'on the photo', where possible.
Don't know if this is any help, but I suspect there is a clue there that I am missing.