I also keep thinking of adding a 5hy to my 4hy then 5i. I can easily choke down an inch make a smooth swing with 4hy and take 15yards off soo that complicates it a bit. As of now Im thinking of 4hy @20(-1) stock length and adding 5hy @24 possibly shortening 1/2- 3/4" for gapping (220 4h hope 200 5hy)