Before asking if it’s ok for the Rabbeim to strike, how about asking if it’s ok for the yeshiva not to pay them on time! Doesn’t the posuk say that you’re required to pay a worker at the end of the day? I’m sure that if you make up to pay weekly, monthly, etc. that it’s ok, but you’re not allowed to pay late! The Torah says so.
Rabbi Yaakov Bender has spoken about this publicly many times. Recordings are out there if you want to hear it. He says that yeshivos who don’t pay on time are stealing!