Do shields have level cap or something?
Example:
I own a Volcanic Plate Shield. We all know it's Normal Defense goes all the way up (i think it's maximum.) Now I've had on it a Normal Defense: High UV.
Does it make a difference? Should I roll for another UV? I mean, the damn shield's Norm DEF is already insanely high. Or does it have a level cap so no matter how I get like a Max Norm DEF the UV is just useless?
Its hard to measure shield defense, 'cause they don't have much in the way of a health bar - they change colour, then break, but all you can see is how many hits it takes to change, which can vary between colours because a hit might drive it halfway through to the next or your shield might regen a little...
To find out if the normal defense is actually helping, you'd have to run damage tests alongside somebody with a non-UV shield, and even then it'd probably be inconclusive.
Of course, normal damage is pretty uncommon in tier 3 anyways - only dealt by retrodes, non-status scuttlebots and gremlin thwackers/bombers, maybe some of Vanadke's damage? Maybe a couple more (just remembered blast cubes, non-status lichen), but not a lot. You might want to try for a different defense UV anyways just to get something more generally useful like elemental, fire or shock defense.