What type of HAs are your Q70s? RIC? ITC? there’s the virto line that is IIC or ITC, I don’t think the quest line had communication between two HAs in the virto series.
50% Comprehension means you understand 50% of the words in a test on the right side? Why wouldn’t you get a HA in both sides? At 65dB I have 0% word recognition( 1 syllable) on my right side and of course HAs on that side make sense.
Maybe I don’t get that comprehension term. check out my signature, not sure if your’s is any worse.
Maybe post your audiogramm to unrule misunderstanding.
Obviously stereo is much better in all situations. so yeah go for 2 HAs unless you’re totally deaf in one ear.
edit: and keep in mind the Q series is very old, unless you like them, have compared others and get a very good price for your Qs, try Venture, or Belong( doesn’t have much added features, is mainly focused on recharables)