I think you have to learn to read your hair and do them as necessary. "Too often" varies from head to head. I've read of some who deep condition every wash. The elasticity test is good, also for me the porosity test. if my hair gets more porous, I probably need a deep oiling.
2c/3a, F/M, ii, med porosity, good elasticity, APL, silvery dark brown.
Love coconut oil, olive oil, and Everyday Shea!
It also depends on the protein treatment that you are using, some are heavy like aphogee 2 step and it recommends that you only use it once every 6 weeks or so, others are lighter and you can use them every week