I've never looked at tension numbers before—I've also for the past few years mostly been using La Bella strings, who doesn't publish tension numbers for most of their strings.That's a mistake, as are occasionally found on D'Addario produce webpages.
For a low E string, even on a 30" scale instrument, to have 15 pounds of tension, it couldn't be larger than .065" (sans the tape wrap).
The correct tension value for the D'Addario ETB92S low E (or for the one in the ETB92M set, when installed on a 30" scale platform) is correctly reported on the back of the package:
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and it is 24.84 pounds. Just a smidgen more than the 090 low E in the Rotosound RS66S set.
Is it safe to assume then that if the tension of the low E is slightly more than the 90 E of a Rotosound set that it is perfectly usable?
Also, the tensions, beside the E, don't seem too different from TI Flats short scale (32"):
G: 32.80
D: 32.84
A: 27.66
E: 35.38
The D'Addarios are:
G: 31.17
D: 30.11
A: 27.67
E: 24.84
My guess is that there must be some people using TI flats on short scales given their popularity?