My thoughts on this; there is no way to put line on a spinning reel off of a spool without twisting the line. Reduce the effect yes but eliminate it, no. Simple physics, two different sized spools. Lay the spool on the ground, or however you choose to deliver the line to the reel, so that the line comes off the spool in the same direction that it goes onto the reel. This minimizes the twist. First time out take a tiny sinker, such as a 1/8 bell style, and cast it long and let it go out over half of the spool. The resistance given by the sinker insures the tension on the line for the entire recovery process and has no flat side to impede spinning and thereby eliminating any twist as it is recovered onto the rod. No sinker does this also but as it gets closer to the boat the drag of the water on the line is diminished and the line becomes more loosely laid on the spool. This can sometimes also cause some twist. The hot water thing has merit as it softens the line and gives it a chance to change its memory, thereby reducing the twist. My guess is that you also need to pay more attention to your baits and speed. Too fast and some will spin regardless. Pooorly rigged baits have been responsible for the majority of my twist issues. Loose drag slipping to excess also introduces twist to an otherwise straight line, reel twists and the bait doesn’t. Having seen these issues dealt with by myself and others over the years these are the most common reasons and solutions that I know of, hope it helps.