absolute barmy to start chopping bits off lines, unless of course, you wish to make a shooting head, then chop a double taper in half, there you have two shooting heads as lighthouse has said a lot of thought has gone into designing fly lines, I don't think the average angler has the know how to improve them.....

There is another way of dealing with this, you can buy a line with a shorter front taper, one that suits your casting, I do think anglers get to involved in these things, I just get on with the fishing and leave all the technical stuff to the experts, I adapt myself to suit the tackle I use, it's worked for me over the years.............
I've heard folk say my rod isn't loading very well, should I use a heavier line, WHY, just arialise more line, that will give you the extra weight to load the rod, improvisation.............!!! To go from a #6 line to a #7, weight wise, to only need to arialise another yard or so.