If I understand the differences correctly, the three versions just alter the static spring pressure by altering where the pressure plate contacts and compresses the diaphragm spring. So the 70 lowers static spring pressure 40%, the 84 about 20%, and the 92 only 7%.
Here is where the problem can come in. The additional clamping pressure from the centrifugal system does not kick in immediately, it ramps up slowly as rpm's increase. So at very low rpm, the 70 may allow slippage under certain conditions until the rpm's increase enough to generate higher clamping loads. Perhaps that is what the gentleman at AIM was referring to when he said there may be issues down the road.
I suppose if one really wanted to prove out the idea that the 70 is OK for a CVO110 they could run it on a dyno and look for slippage at low to midrange rpm. IMHO, people who ride normally and don't use WOT between idle and 2500 rpm probably won't have a problem. Folks who hammer the stuffing out of their bike should probably stick with the 92 or even go with a complete aftermarket clutch replacement.
Jerry