You... get 1000+ kills very often? You say you're new so if you are being srs I'm impressed. Also people go for special spin kills because it gives more points. If you do a normal attack and a special attack at the same speed in the same area the special attack will do more damage. If your special does damage, obviously.
About the spinning around the head - it's people failing at using the Swing maneuver where you hook a titan around the mid-face region, go into the air and fly past, but when you reach it, manually dual hook and it gives you the right trajectory to get into their nape of the neck. Fail it and you just fly around in circles. And I have to ask; why be afraid of using gas? There's refill and it's pretty silly to me at least to not check your gas often /make sure you're not going to run out.
Really for me I just outmaneuver titan's or nor let them notice me. A titan that hasn't noticed you cant really do much when I've got them hooked and spun up their neck. Like seriously, just try to not let them notice you and it gets a lot easier. Still room to fuck up though. Usually I just get behind, dual hook around the middle of their back and kill them easily. Or dual hook around the tip of their head, fly over them and they usually try to grab you but you're long gone. Then you're behind them, they're trying to grab nothing, and you have the time to kill them. Or use dodge.
Not enough people use dodge. Especially vs Aberrants. When they go to belly flop just lol dodge and get behind them, WAIT FOR THEM TO GET UP, then when they are standing still for a second after belly flopping, go for the kill. It's too awkward to go for a kill when they're on the ground unless you're Mikasa and if you fail you're right in front of it in it's attack range.