when I shot recurve I had exactly the same problem. I have a short face too. Some people just don't understand how difficult and frustrating this can be. Face shape makes a huge difference to the possible site mark.

I did try building up my tab but found the reference point felt very uncomfortable. Almost like my hand was floating about. Try it by all means, but for me, it did not work.

I found the only way to get the distance, with my 39lb bow was to buy the lightest arrow I could ( ACE670). Even then I could only just make it. Rik made a good point here. Check the nock point. It can make a world of difference to the sight mark too. Keep it as near neutral as you can. You need to squeeze as much power out of the bow you can, you need speed, but I'm sure you know all that. It's quite frustrating. When it got cold or started raining I was again back in the same problem and had to aim off. Something I hate to do.

I hate to say it but if you are struggling you may need to upgrade to ACE's. They are a good 30gn lighter than the Navigator, maybe a little more, but I have no info on the 660, only the 610. The ACE will in theory give you between 5 to 10 feet higher hit at 90 m. based on 1gn = 2" to 4"@90m. Try and borrow some as a test.

Hope this help
Rich