Good day, Does anyone have an explanation as to why the bulb on an IOM should be canted up at the forward end +/- 2 degrees? How critical is it, and how do you measure it? I made a template of the fin and bulb, and measured 2degrees over the length of the bulb, then measured the "lift". Adjustments were made with flattened crimps in the bulb slot. All a bit crude.