Focusing on total ascent is sort of like focusing on any other single metric such as time, calories burned or distance. I think you could improve things by combining vertical gain with other criteria such as steepness of slope (you could work out 3 different slopes, say- mild, moderate and steep), rate of ascent if you have an altimeter, heart rate and breathing. Then with modulation, progression and consolidation, adding weight for ME and so on, I am sure you will come out the other end a lot fitter than going in.