I never had had much luck getting plum and square cuts with my hot saw. It's a cheap Harbor Freight 14" with a flexi-flyer chassis.
The inexpensive blades aren't very rigid and the ones I had started cutting slower and walking as heat built up, this was on heavier walled 1.25 x 2.5 tubing. I shelved the piece of poo.
My liquid cooled horizontal band saw cuts within 100ths when properly tuned and the small cold saw seems to be very accurate as well.
Maybe try a different blade from an industrial supply house?
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