Ron last is a very nice last for loafer, sleek but not too much.
I suggest you to order the size 10 if you have heel slippage in the hiro 10.5
I've inquired them about new SS string loafers, and they told some new models will be added to MTO page within few weeks.
I suggested a Chocolate Brown Lama Calf version, I hope they will consider it.
Those Galway boots are very nice and have lot of potential, but the wide eyelets position and spacing kill them as usual.