I used yesterday some Adox vario classic (triple paper weight - it is great paper!) - and I used combination 0 filter + 5 filter. Results are promising: after testing it looks like my "problematic" high contrast negatives are printing best with 90% exposure time with 0 filter and 10% of exposure time with 5 filter. With some additional burning (without filter) and dodging - it was not so hard as I expected.