Before actually cutting, I was going to look into filler relocation feasibility to make those louvers larger towards the front.
'Forgot about that pesky thing. Filler relocation wouldn't be a picnic, that's for sure...but undoubtedly 'could be done (if only by following the "bigger hammer" theory/philosophy of car building).
What about designing/incorporating a 'hinge' mechanism so that the louvers that cross over the top of the 'cap could be swung out of the way? That would appear to be a far simpler 'solution' to the lopsided visual symmetry problem?