Originally Posted by EtherealEntity
I use this tuning on 35". D'addario .145 gauge, JUST about cuts it so I wouldn't go any thinner on a 34".
This is exactly my experience too. A D'Addario .145 at Ab on 35" is at the limit of good tone. On 34" it might just work (I would recommend 145 + 100-40set + 28)
Even better is a specially designed 'drop tune' set from Circle K Strings: Circle K Strings - Standard Drop-tuned 6 Strings
. These 'balanced tension' sets have gauges chosen to result in equal tension on each string in the drop tuning. I recommend the .150 set or heavier, the Ab will sound much better than a .145.