I actually had a real Fighting Games as references to the animations, up to literally copying some from other games, so this should be perfectly fine. In MK11 animations are even slower - 7 startup frames for jab in comparison with 4 startup frames for light attack in my game.
About "floaty jump", if it was about the in-game jump action, the Jump, Launch and Airborne Attacks affects the Gravity in a certain way to regulate the speed of falling down. It is needed to execute the Air Combo properly.