Spool, Earl used a 70" cue on a ten foot table on his last match with Shane VB. I don't think he uses one on a regular basis.
Many tall players will try out a 60" cue and that seems to do the trick for them. A couple of extra inches seems to do the trick.
Any of the cue makers here will work with you to get you that far.
I bought a 60 incher from a maker here, Will Adcock a couple of years ago.
He may even have one in stock and his prices are reasonable. Both cues I had from him played very well.