I personally think that the length of the cue is absolutely unimportant.
Since i restarted about 4 years ago I also tended to hunt down longer cues (60") get longer shafts for my normal length cues, ordered extra long shafts here and there. bought 30" butt 30" shaft cues etc,etc......
....to find out one day when not being able to pot a ball, cause of being "overmaterialized"....just take a nice 57" house cue - it was probably the only serious cue in a batch of 100 - and play with it, be happy with it, don't worry about potting and position....just do it....
finally ended up with a 57" Jensen which is now my main player, damned that cue is so short - simply perfect and I don't even think about getting a longer shaft for it.
I hate bridges, and am 187cm tall..... (6.14" ??)
Matt
PS: the Jensen was sent to me, I didn't even want to have it and already had offered it to someone else, luckily decided to try a few balls with it, I hated the cue in the first two days, but the fact that I did NOT make balls with it from the start, made me curious....the "new cue" effect was absolutely missing