Ilford filters give the full range of contrasts without the need to calibrate a dichroic head. Based on what you have said dichroic calibration is not the answer to your problem. Do what Chris Crawford has suggested initially.

If that doesn't solve your problem then it is even possible that your personal film speed is wrong i.e. it is possible to develop longer and still not have good negs that will give a fine print on grades 2-3. Your exposure based on a correct film speed has to be correct.

However first things first. Develop for longer and see what does does