I don't do soil, but...
- I'd consider filling the pot more, so the plant doesn't sit so low inside the pot, and
- I would avoid placing things inside the pot with it, like you have the hydrometer in there.
My reasoning is that when the lower part of the plant sits inside the bucket, there's less air and light penetration, and it also causes leaves to touch the pot, leaving the door open to leave damage and the plant feeling like it cannot grow in that direction because there is a barrier.
Just my two cents. [emoji106] [emoji6]
Oh, and this may be an easy and cheap way to deal with the heat issue...
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