Do not lube the neck or shoulder. After you apply the lube to the case, wipe off the neck and shoulder with a clean cloth (leaving lube on the body) before resizing.
Also, put a small amount of lube inside the case mouth on the first case in the batch to prevent stuck case.
If you leave lube on the neck and shoulder you can get the 'hydraulic dents' you are seeing.
Not sure what you mean by having to trim 1/3 of the brass, that sounds like an awful lot of trimming