Regarding the combinations of yellow and magenta filtration on different manufacturers' diffusion-heads, start off from the values on the information sheet inside the box of paper. It can also become intuitive to pick a grade based on the neg, make the initial exposure (with burning-in or dodging) and then add more or less contrasty exposure(s) where needed using higher/lower contrast filtration - possibly effectively the same as you were doing using the filters previously, but adjusted to allow for the different way of setting the contrast level.