Will tuning 'up' my Eadg strings on a 5 string add too much tension on my neck? I'm trying to match a 6 string guitar tuned to drop B. I know I could go BF#BEA, but I'd like to match exact. I would prefer this option, but I could also tune a 4 string way down to drop B. What modifications if any would I need for both options. Has anyone ever heard of tuning up a 5 string?