I don't think you fully understand dexterity if you think 1m spd should not be able to hit 4m dext.
Dexterity is the ability to dodge attacks, not become invincible. The higher you're dexterity the better chance you have of seeing an attack coming and being able to dodge. There are always players out there with better stats and there is always the lucky shot.
4m dext is just starting to grow dext but it is way to low to expect a 1m spd to miss you every attack. Stats are based in 4 groups and you need more then 1 good stat to expect to win battles.
4m dext v.s. 1m speed = 1m speed will hit you most of the time. Get to 50-100m dext, by that time you will get it.
My dext works fine and does what I expect it to do.