Interesting you bring up the guitar and dead lifting. I don't get any long term problems but I cannot play well after deads. It totally screws me up. I usually lift earlier in the day but on my current routine I do back on friday. Only thing is I have a gig every friday playing jazz and I have to wait till I'm done with that to do my w/o.
Anyways I just busted out my straps again and I can lift more with them on any pulling exercise, but I only use them for bent over rows over 225 and pullups and thats if Im working bi's too. BTW I'm more of a bodybuilder than a powerlifter, but I do like improving my strength.