I dont want to get into the middle of this discussion, however the shorter the shaft, means less weight, equals more power, longer shots,,,,I shoot a mares 150cm, asso 135, asso 115, and I have all my shafts specially made by aquaknots in miami, and I have them make them as shorts as possible for every gun I use,and it has worked out for me for many years,,,,that it my 2cts worth.
I have been shooting big air guns for a long time, its a matter of getting used to it, however on the 150cm I use a knee loader, and that helps alot with loading. I use the 150 for deeper waters,,,,,on the reef I use the 135 or the 115, it depends on what area we are hunting in.