"Absorb kinetic energy during travel time" is what I'm gathering that these special, illegal SABOT rounds do. Which, considering the only kinetic energy they'll face is wind resistance and possible compression of air in front of the bullet (unlikely, anyway) would result in... what? The SABOT round absorbing the energy, sure, but how would this increase its speed, if it has no propulsion mechanisms to convert said absorbed kinetic energy into greater speed?
Also, I find that the term "kinetic energy" is thrown around a LOT as just a sciencey technobabble buzzword. Kinetic energy is just the movement of an object and its ability to impart that energy and movement towards another.
Given that, if any round, SABOT or otherwise, impacted Hoopdy's character's armor it would be a case of whether it was travelling fast enough to overload the kinetic absorption mechanism in Hoopdy's kinetic shielding. Let's take Mass Effect's kinetic barriers for an example. They use mass effect fields (generated by element zero, something lacking in our universe) to trap projectiles moving towards them and stop them from impacting their wearer. Now, if shot too much, they break. Their capacity to shield is broken.
A similar condition could be conjectured for Hoopdy's armor. If any round, or sufficient rounds, were travelling fast enough (with enough kinetic energy) I imagine that the suit's absorption tech would not be able to contain it and convert it fast enough to protect him and boost his handgun. Therefore, to put it simply, if shot too much or too hard, his armor would cease functioning as intended.
Of course, such a limit is determined by Hoopdy, or Domo if it comes to such drastic measures (which I doubt it will).
EDIT: Here we are. Something is specified, at least in the "Pangolin" (love the name btw) armor suit thing. "15 tons of physical force." That's the shielding's limit. Good.