Well I'd go up one voltage step on both ICH 1.1v and ICH 1.5v and see how it responds. I've no idea what safe voltages are though, but I'd imagine 1.12 - 1.14v would be ok. A small increase to say 1.13v for ICH 1.1v and 1.52v for ICH 1.5v should show improvement if its going to help at all.