Conclusion: want a specific UV? Buy pre-made. Want to try your luck? Roll a random UV but don't complain you got a Low. Because you will. Link to file with all roll results can be found at the bottom of this post.
Its certainly possible to get CTR VH on calibur. But sometimes it takes 134 rolls...
Test results below:
Normal server (wasted 22k ce, didn't get ASI VH or ASI High or CTR VH or CTR High), summarized rolling results can be found below:
Totals:
45x Low
15x Med
2x High
5x Very High (got lucky, I guess)
9x ASI (7x Low, 2x Med, 0x High, 0x Very High)
6x CTR (5x Low, 1x Med, 0x High, 0x Very High)
9x Beast (6x Low, 2x Med, 0x High, 1x Very High)
9x Construct (7x Low, 2x Med, 0x High, 0x Very High)
6x Fiend (2x Low, 3x Med, 0x High, 1x Very High)
8x Gremlin (6x Low, 1x Med, 1x High, 0x Very High)
9x Slime (8x Low, 0x Med, 0x High, 1x Very High)
10x Undead (3x Low, 4x Med, 1x High, 2x Very High)
Approximated chances of UV for weapon:
1/8 chance for ASI
1/8 chance for CTR
6/8 damage bonus vs monster
UV Level (regardless of "family" of UV)
67% or 2/3 - Low
22% or 2/9 - Med
3% or 1/30 - High*
7.5% of 1/13 - Very High*
* - didn't get High/Very High on ASI or CTR family of UVs, got more VH than H, probably just lucky.
Test server rolling study! Did over 200 rolls, summarized test results are below.
Irony: got ASI VH on flourish on 6-th roll.
Total: 207 rolls. Rolled on several different weapons. Aimed to get CTR VH on calibur. First VH was fiend, 60-th roll. Got CTR VH on 134-th. Other "uber" UVs: ASI VH - 6th, 7-th, 36-th; CTR VH: 24-th
Total VH: x10
ASI x3
CTR x2
Damage x5 (slime, beast, undead, fiend x2)
High: x17
-ASI x5
-CTR x2
-damage x10
Med: x41
-ASI x3
-CTR x3
-damage x35
Low: x139
Chances are:
Low - 67%
Med - 20%
High - 8%
Very High - 5%
More or less the same as I got on real server. Chances to get specific type (approx):
ASI: 14% (28)
CTR: 11% (23)
Damage - 75% (156)
Remember, current test was done on test server, actual chances on main server may be different.
XLS file with all test results on both servers (separate pages) can be downloaded here:
http://www.2shared.com/file/Vpr7Sk2Q/spiral_knights_uv_rolling.html
Actually the conclusion should be: Uv sellers underprice their items