A new Vass last with a lower instep? Thight might make me try them out again. I was about to accept Vass' Italian lasts incompatible for me but Mr. Kuti's customer service makes me open to trying another last.
I've found tongue pads very helpful for shüs with a high instep, though I'll have to forsake lasted shoe trees for these modified pairs. The pads with trees will only stretch the instep further. There's no reason to shun Vass just because their lasts are high.