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Is it me or does that plant not have a growing tip? That would explain also the tendency to make new suckers from the leaves.
The gnarled leaves are already old, the reason they became like that happened quite a while ago and it's related to fertilization. Excessive growth will make this, now the exact cause I don't know, and there isn't much info out there but it's probably due to some element or the other not being able to keep up with the growth (according to grodan that element is Ca, but I really think Cu to be more likely involved).

I would also check that pH. Water well but slowly until some excess comes from the bottom, measure pH with pH paper or meter if you have.