It also could be you were:
1) Inside in the cage-Some guys get a little closterphobic and get woried about hitting something.
2) On a fake wood mound-some of these are slippery,some are tacky. Nothing takes a pitcher more off his game than worrying about where/how your feet are going to land.
3) Had the protective screen up in front of you. Some guys just do not like the screen up.
All these things make a pitcher uncomfortable until you are used to them. Have them recheck your velocity once you get outside away from all the distractions.
As to whether your going to get cut, It sounds like they have three good starters that they like. More important than velocity, you have got to get your strike count up. Ruffly throwing a strike 1/3 of the time is an automatic cut for a pitcher. It makes you easy to cut.
Can you make your team as a position player and offer to throw batting practice to the team to "save the other guys" for the games?
When your confidence come back, so will your velocity and control.
If you get cut, still make the offer, it might make all the difference next year.