The game render resolution (rather than the steam or OXR resolution slider) has a huge impact on efis legibility.
100-120 on the in game resolution slider gives ridiculously crisp efis on my G2 but is extremely demanding.
Basically if you need more efis legibility then you need to up the in game render resolution, and then lower the steam resolution as required to maintain performance. Try and find a balance that works for you and your GPU between game render resolution and steam render resolution.
70% on the in game setting also seems to work better than 80% for some reason, so try 70% and 100%… again adjusting steam resolution as required (the in game resolution you can change live and observe the difference in real time, but steam render resolution will probably require a restart to take effect).