Vitor Manuel
Can I change the settings of Hialgo Boost to lower the quality by less than 50%?
No, I don't think it is possible. You can only make it bigger than 50%: 60, 70, ..., 90.

From :

  • Ctrl + Shift + (+/-) controls the minimum allowed resolution (50%...90%)

(We tried lower resolution, down to 33%, during development, and it is still available in the old Boost, which works for Skyrim only: