I took another shaman on my server, actually 2, both have the BiS Ring, I don't. We agreed to all use 940's Prdyaz as 2nd, while they had the rings I had the boots.
We agreed to use Nightblooming Frond as Trinket + BTI.
ALL OF US are on 25 Haste and we vary from 71-73 % Mastery ( me being the one with 72 )
I do have the 4 Set,
one has a 2 set, the other one 2/3.
We made various legths, from behind the training dummy,
and I always ended up 1-2 procs LOWER than them.
Is there a chance our set is bugged?
EDIT: Results
Skilling WS / HH and OC, turning due melee attacks so it doesn't proc,
filling up with Rockbiter and then spamming Lavalash 100 times, seeing how often
SS procced ( should be according to 4P bonus @ 20 ) but:
Mutliple Runs ( in now total 10 on my own, 20 with other 4p Shamans )
showed ( results posted in threads )
that the Average SS Procs vom Lavalash pendles in at 14-15 instead of 20 ~.
Run 1: 16 Stormstrike to 100 LL
Run 2: 15 Stormstrike to 100 LL
Run 3: 12 Stormstrike to 100 LL
Run 4: 16 Stormstrike to 100 LL
Run 5: 16 Stormstrike to 100 LL
Run 6: 17 Stormstrike to 100 LL
Run 7: 16 Stormstrike to 100 LL
Run 8: 16 Stormstrike to 100 LL
Run 9: 14 Stormstrike to 100 LL
Run 10: 11 Stormstrike to 100 LL
EDIT 2 - thanks for everyone's input. It seems to be a combatlog issue, but since the increase from 2P to 4P still seems to be legit on sims and live, it's nothing else than that.
Cheers for the help folks.