This very simple patch allows you to give each enemy a unique timer for how long samus gets knocked back by it.
This means you can make it so zoomers knock samus for 5 frames, but mama turtle knocks samus for 30 frames, giving the sensation of enemies knocking samus with greater force.

You can set the timer by using value 16h in the enemy header (for SMART-users that's Unused_1 in the enemy dna editor)

uses no free space at all!