I think I'm seeing some points of confusion about light transmission vs contrast and what to expect for resolution in binoculars.
First, the light transmission percentage doesn't tell us anything about contrast. Possibly the OP is confusing it with the Strehl ratio, which is an expression of contrast. High light transmission can be combined with high aberrations so that the Strehl ratio is low, meaning a large percentage of the light transmitted falls outside the Airy disk of a focused star point. Binoculars are not low aberration instruments and are not intended to be. They are for hand held use at low magnification where the low wave front errors of a fine APO refractor are just not needed.
Secondly, even mediocre "civilian" binoculars should do better than 240/D for resolution. I think I've only measured resolution that bad a couple of times and those were defective binoculars. AFAIK, there is no requirement for exquisitely good optics in military binoculars. I can't recall the exact resolution spec required, but I remember it was modest. High mechanical quality is what is demanded. At any rate, really good "civilian" binoculars usually have resolution that falls somewhere between 120/D and 150/D at full aperture. In my own binoculars I like to see it at least 130/D at full aperture and around 120/D when the binocular is stopped down by the eye in daylight to around a 2.5mm exit pupil.
I quickly measured the resolution of the left side of my old 8x30 Habicht using the USAF 1951 chart and boosting the magnification to 64x. Full aperture resolution was about 124/D (4.1"), which improved to about 120/D (5.45") relative to the aperture when the objective was stopped down to 22mm (2.75mm EP). These are excellent resolution numbers for a binocular, the second about twice as good as I can see when looking at the chart through it at 8x. The overall image in this particular binocular, however, would be cleaner, more relaxed and more natural with improved coatings, a better eyepiece and lower spherical aberration, but the visible resolution on the USAF chart at normal magnification wouldn't change at all.
Henry