Canoe top leaves dry sandpaper feel?

This is my first grow. Growing 3 plants, one plant about two weeks ahead of the other two. coco/perlite in 5 gal smart pots
900w led
Flora trio
The concern is the lead plant. Top leaves canoeing and most the leaves feel dry and rough.
The other two are doing ok now but am seeing signs (couple weeks ahead) of the serrations starting to curl.
I have started feeding more nutes due to me thinking to low. Was about 350-420 ppm and increased to about 500+ in the last couple weeks. That is also when signs occurred. In process of light flushing now.
Thoughts and help please?!

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Welcome ! My first thoughts I would start by verifying my pH meter in a clean bottle of 7 solution. And also verify my TDS meter in a standard bottle of conductivity solution. Then water to runoff check my numbers. (pH an PPM) Also is your light the correct height by manufacturer’s recommendations . Good luck.

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