Unless you are totally in control of your scene's illumination, you will likely need dodging and burning.
I'm not interested in dodging and burning at this point.
Don't trust "the literature"
The literature suggests that a grade 2 or 3 filter will cover most printing needs, but my results with these always seem to be flat.
Increase negative development by 25%
As such, I find myself using the grade 5 filter more often than not.
You thought wrong.
I thought grade 5 was for slightly more advanced techniques -- like spilt-grade printing -- and not really to be used by itself.
See above (Increase negative development by 25% and use dodging and burning).
Even so, I'm not completely satisfied with my grade 5 prints.
That is a good technique, but Ilford already did it for you if you use Ilford papers (see the chart they put in with all their paper packaging). Realize what is going on with the 'calibration.' It allows you to change contrast and keep your exposure for middle grays constant. It does not make your final prints look any different, it just saves some steps getting the exposure correct.