This basically all comes down to feels.
Some people shame that "feels" and they tried to get all technical and specific with frequencies, dips and spikes and so on.
What I would suggest is to just figure out what works for you, three times a week is not entirely necessary but it's not unheard of. In the past year I've been using my test cyp twice a week, and I feel great, libido is much better. Back in January and February I lowered the dosage a bit and went EOD, I really didn't notice much of a difference but it felt equivalent to the twice a week protocol..
For years I've always did every 6 days with test cyp.
Never any real major drawbacks, but I just feel better now at E3D..