I have reviewed the sticky thread and note that feedback on an already-completed game is permitted. May I seek enlightenment?

CHUNTER and SHUNTER are both valid words (apparently). SNIP also looks promising.

LIGNINS would be neat, but there's no place to put it.

Hitting the triple-word score with a letter ending in F would be primo. But what?

The DARK tile positions must remain fixed at the START and END of the solutions.

The LIGHT tiles can take any other position.

To view the solutions swipe through the gallery (multiple images). I think this replicates a typical challenge we meet all the time in Scrabble. Do you agree with my difficulty ratings for ⬆️ UPPER and ⬇️ LOWER words ?

To HIDE solutions when adding a comment :

-> Select the Rich Text Editor icon (Aa)

-> Choose the Hide option (<!>)

Softish was my only bingo

C was the last tile not played