@miningpoolhub
1.Those results are with genoil miner. Currently there is no way to get better results on 750ti and windows. (Some users report 5Mhash on linux)
2. I cant see a reason for x15 - no worthwhile coins that I know of (almost the same for x13)
Skein coins are added on the site, just not exposed on the main list. Can always be compared separately.
3. Sounds like you had a different (not default) value stored in a cookie for X11. Also possible you tried this when I have updated the multipliers

Value for X11 is not supposed to change - the buttons are only for adapating the rates and powers from X11 values.
4. 12Mhash is a real value for a single 280x, so is 250W power that goes with it.
For 750ti, as written in latest post, those values are: 3,25Mhash 75W