First of all, nice mod!

Minecraft version: Forge 1.14.4 (1.14.4-forge-28.1.109)
ModLoader version: Forge
Mod Version: v1.14.4 b6

It seems that the player is taking 1 heart of damage on every teleport. This seems to happen regardless of distance or velocity. My best guess is that the player is being put slightly inside the block and taking damage that way. Ideally, the player would never take damage from teleporting.

Actually, I think I'm seeing that this is intentional:

player.attackEntityFrom(DamageSource.FALL,2);

Would it be possible to make this a configurable option?

The ender pearl upgrade damage was removed

Thanks!