Coaches consider pitching/batting matchups. Commonly right handed pitchers to face right handed batters. Deeper than that they scout batters tendencies and weaknesses - bad curveball hitter so they may choose their best curveball pitcher to send out there.
There is also bullpen management to consider throughout an entire series. These college pitchers may be good from 1 or 2 appearances over a 3 game series. You don't necessarily throw your best reliever out there on Friday night, it depends on the circumstance. You also don't put your best reliever out there in the 7th inning, you may be saving him for a high leverage situation or the 9th inning.
Finally, I think if you look at the stats you and Coach Pierce (or Woody Williams) agree on who the best relievers are. Shaw and Tole are the relievers with the most usage. Hurley has even more innings but he did start 5 games. In fact, the most used relief pitchers are the ones with the best ERAs. Only exception being Zane Morehouse and we all saw how that played out this year - tried him as closer but made the change when that wasn't working out.
So your gripe would have to be timing of when certain pitchers were used, not overall usage. And like I said, no baseball fan has ever agreed with pitching changes in hindsight if the other team scores.