your process looks ok to me,
ive used z2 before and not liked it so dont touch it now but if it works for you thats all good,havent used zymoll carbon but have heard good things so keep using that if it works for you. aquawax is fine to use inbetween washes so keep going with that.
to remove all the above you need to give it a good wash obviously and either use a good tfr or a strongish apc to completey remove crap and it will remove the sealant and wax partially, then clay and re wash, get a good single polish not an all in one and polish the car by hand or machine, machine for correction and hand just to remove surface stuff,and then your finall stages which you already know about so go for it.
hope this helps
Dan