I have a problem w 'wide' convex lower lateral crural cartilage. Can a bulbous nose be helped by pulling LLCCs forward? (Photo)

The lower lateral cartilage ideally points toward the outer aspect of the eye (the lateral canthus.) Occasionally, the lower lateral cartilage points to the inner aspect of the eye (the medial canthus.) When the cartilage is in this position, it can create fullness and excess width in the supra tip area. This fullness can be corrected by excising the uppermost aspect of the lower lateral cartilage and by transposing the cartilage, either with or without a cartilage graft, into a lower position. This is a procedure that is best explained with the help of visual aids during an in person consultation.

You have just figured out what the great Dr.  Sheen described 30+ years ago.   You have cephalically oriented lower lateral cartilages.   The cartilage that extends from your tip goes more up than is ideal.   Ideally,  this cartilage should more or less parallel the nostril rim.   In your case the cartilage goes more upward,  causing fullness above the tip.   At the same time this leaves the rims less supported,  causing weakness with inspration and therefore nasal obstruction.   In some cases it is necessary to relocate this cartilage into a more ideal location.   See below for an example. 

Manipulation of the lower lateral cartilages can improve the appearance of your tip by narrowing it and improving projection.