Whats the new growth look like??? You should be about halfway through the first couple week growth explosion. If your new growth is keeping up with, or exceeding the droopy / "shedding off" bottom growth ... then IMHO & in my limited experience there isn't much of a problem. The lush new growth is where the party is going to be....
That's not to say that the top side is looking & feeling much better.... but some info on the Top side might help us make a better diagnosis on the whole plant.