On recoat jobs where someone else has previously blasted, you are pretty well stuck with getting the same (or deeper) profile. It's almost impossible to reduce a profile once you have it.
On the flip side, some contractors just blast the hell out of the surface and achieve too deep of a profile all on their own.
To determine where the deeper profile is coming from, you would need to clean a small area in a way that will not deepen the profile. Three methods come to mind:
1) Blast with a very fine abrasive (maybe 200 mesh or less) and determine DFT on that area.
2) UHP water blast determine DFT.
3) Chemically strip and determine DFT.
Deeper profiles (and sharper profiles) will generally give better adhesion. HOWEVER (and it's a big however) - you have a much higher risk of pinpoint rusting. Blasting almost always results in scattered "rogue peaks" which are much taller (think 2x taller, maybe more) than the typical measurement with Testex tape. Typical solution is to require a thicker primer, with a letter of approval from the owner/specifier and from the paint manufacturer.
Epoxy zinc coatings are generally pretty forgiving of extra thickness. IOZ are decidedly
NOT forgiving of over thickness. Zinc Clad II is an IOZ. Over thickness in IOZ generally leads to curing issues and mud cracking.
The data sheet (linked below) has a recommended dry film thickness (DFT) of 2-4 mils (50-100 microns), and a
specific warning not to exceed 6.0 mils (150 microns).