I've cut 'e mshorter, kindo f like Charlie showed in his pic, and Ive run 'em 2-3" longer.
When I build arrows I want 2 things- adequate arrow weight, and perfect arrow flight. I do not reference my arrow tip while aiming, so it doesnt matter much to me if theyre a little longer. Ive been running them 28 for the last few years, this last bunch I changed my arrow setp by adding an additional 100gr up front. I upped the spine weight of my shafts, and ended up with a 29" arrow. I could get the next lower spine to shoot well at 28", but the overall arrow wieght wasnt as heavy as I wanted. By ading an addtional inch of shaft, I picked up 15 gr more arrow weight. I wanted them a minmum of 600gr.
I had built some a few years back so that the back of the broadhead would touch my knuckle, which i liked, as its like having a slient clicker on the bow, but as i tweaked my form I found I was short drawing, so now all those arrows are too short.