Please, what's wrong with her

Planted 1seed each in 5 gallon bags with FFOF soil on June 12. Seeds are suposed to be Auto Alaska Purple. Watered frugally. Used 1/2 dose FF Veg after 3 weeks once (1/2 gal each).
The healthy plant grew as a xmas tree and other as an oak tree with lots of branches.
When they started flowering gave them 1/2 dose FFBB, 1/2 gal each. I don’t water until bags are light.
The spindly one started leaf burn on tips. So I purged it with water and elevaded its light.
Then watered both with water. I use rain water.
Each has its own Viparspectra p1000 light. They’re in a 3x3 tent with a

78 to 81 degree temp with 57% RH.
Its obvious that they aren’t both Alaska Purple
Just don’t know what to do with the leaf burn.

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Not much you can do about that. If you have a ppm meter it would help out.
As far as appearance goes, each plant is it’s own, probably a different phenotype. They can be two sisters from the same parents, but neither look identical to the other. But they are related.

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TDS of 760

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Your ppms should be around 800 so IMO I think your good there. How close are your lights?