Mixet shower cartridge

I replaced my Mixet cartridge yesterday evening, and things 'seem' to be working with two exceptions:

1) the mixer handle rotates all the way around

2) I can get 'some' cooler water, but it's mostly hot

I read on another post that I should have extended the cartridge all the way before installing... will that resolve the hot/cold?

I also read a post about some 'extension' that is inside the old part that I didn't bother trying to pull apart. Is that the part that deals with the full/partial rotation of the mix handle?

There is a brass washer made onto the cartridge body that has a notch in it, and another brass washer included. Any instruction on alignment of the notch or where exactly the extra washer goes would be good information as well.

A small write-up on the back of the cartridge pack might have been useful if it's more than just screw it in place ..

Thanks!

-Dave