I look forward to the pics... sounds like you diagnosed it well,, It could also be over watering...

if it is a N overdode.. you would probably see the leaves turn DARK DARK green and the tips of the leaves would be brown..

overwatering looks a bit different, the whole leaf looks "soft" like a KACK that's been humped to death...

where ass a N over does is more of a stiff, ridgid turn down...

you could also spray the leaves with distilled water, this may help nut over dose..

: )