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@Ghaben
An old thread, I reckon... and you may have already found what the problem was. Notwithstanding that, your problem is that your BB has the 51.3mm centre sleeve designed for 68/73mm BB shells, which means that in a 73mm shell, the retaining rings (cups) go flush with the edges of the BB shell, but in a 68mm shell, a portion of the cups protrude, by design.
If you want your cups go flush with the edges of the (68mm) shell, you need to replace the centre sleeve with a narrow, 46.3mm one, you can in email-order it from Phil , for about 15 quid.
Phil BB-s with 105mm spindles or shorter come with the narrow centre sleeve, by default.