Ok I see. Well, for what its worth I think Grant Stone have uneven sizing in some of their lasts (Edward is a particular offender), with the toe space being good but the heels being far more voluminous than average vs other brands.Yea. I imagine an insole could help some people. I did try a few, but they admittedly were not of the leather variety. Insoles I find have positives and negative for slip ons. The instep could fit better but my heel will also be that much closer to sliding out with an insole. Perhaps I will give loafers another try eventually to revisit the 'issue'. It's been a good 3 or so years since I have tried any loafers.
My brannock size is 9.5D. I have tried 9D and 8.5D. I don't think I can go down any further. Additionally, with Rancourt I tried 9D, but those run more TTS so 9D was already a little tight in the toes while being very loose elsewhere.
I suggest you look at Carmina instead, they have so many lasts to choose from.