Hi guys, I bought a pair of Sebago classic dan loafers. Initially bought a US10.5 (half size down from my usual US11) which I returned for a 10 due to heel slippage. The 10’s are here today but the heel is still slipping!? From what I’ve seen a lot people say it’s due to leather being stiff and not moulding to the foot yet? Would love any insights or advice if possible ! (Also my toes are almost at the end of the shoe so I don’t think sizing down is an option)