I'm sorry that I cannot give you the ultimative advice. Shomen uchi ikkyo is the first technique (together with irimi nage) that we learn where I train. I trained ai hanmi katate tori ikkyo yesterday and I still do not understand it, even if I'm first kyu now. My teacher watched me and then sayed: the point you lead your partner is maybe your point of imbalance, but not hers. So it's diffrent whenever you train with another partner. I think one point that keeps me going on on the AikiDO is because I want to solve my mystery of ikkyo.
Hope that helps,