Bowmaster,
How easy are you shooting the 50? If it is very easy then I think the jump to 60 will be easy for you. I personally jumped from 48# to 85# and did just fine and still shoot that bow today. I had cancer surgery on my shoulder and had chunks of the humerous bone removed and replaced with cadaver bone, then I dropped to a 70# bow. I worked with it until I was able to shoot it with ease for as long as I wanted, then went back to the 85# bow. I still shoot both though I tend to lean towards the 70#er because I like the bow better. It is a Howard Hill. I plan on having Craig make me an 85#er as soon as I can though because I prefer the heavy bow weight. I may be the exception to the rule, but if you shoot the bow with ease, for as long as you like, then by all means move up 10#.
Hillbilly