can't really help you with the short scale part of this, but within the past month i have become a nothing but Eb tuning player. mainly started when i got heavy into Alice in Chains and now i'm starting a grunge band so i figured, why not follow the greatest?. but i use D'Addario EXL170-5SL for my Traben with gauges .045, .065, .080, .100, and .130, unless i use a High C instead, and they work fine, again, doesn't help with your short scale problem, just thought i'd throw my 2 cents in here :-D
~Taylor Watterson