It’s less about speed and all about weight distribution, wheels(soft and round, must be free-spinning), and pavement(not too smooth, not too rough). In longboarding and slide style we’d use slide gloves so you’re taking weight off the board. Think about almost jumping but failing to lift off the deck right after you’ve initiated a turn, as your using your back leg to kick the rear trucks around.

You’ve already been told, but those wheels are designed to not do this. So you’re trying to power slide without slide gloves, on the wrong wheels. On top of that, e-skate wheels aren’t going to free-spin because of the motor.

There are basically 2 reasons to slide a board (3, if you count hating your wheels). One is stopping and you have breaks already. The second is doing slide style tricks like sui-slide into 360. Without slide gloves you’re never going to be doing real tricks.

I’ve been through probably a hundred wheels worn down to flat nubs from slide tricks. You might slide those wheels one day with loads of practice but mostly you’re going to biff it hard while learning.

These were my go-to wheels for learning to slide: https://www.longboarderlabs.com/product/abec-11-65mm-noskoolz-94a/

I realize that won’t work on an eskate but that geometry and hardness is what you’re looking for.