I've spent a lot of time polishing boots. I was in the Air Cadets, Army Reserves, and I have close to 10 years in the Regular Force Navy. I never really got good at polishing them until a couple years ago, while on my PLQ course.
I used to use a dry cloth to dab in the polish, then dab with water, then start with the small circles. I did that for several years, and had several years of crappy boots. Old CPO1 Wiggins had me in his office a couple times for them during my Fleet School days.
Now, before polishing, I soak my Kiwi cloth in water and wring out until just slightly damp. I take a dab of polish and start with the small circles. Aside from the occasional huff of breath to fog them up, I add no moisture to the boot. No spit, water, alcohol, or anything.
You don't need parade gloss, heat guns, lighter fluid, etc... That very subtle change has made a world of difference, and my boots have improved a hundred fold.