Your experiment is flawed from the beginning. Even if everyone has the same race, the same gear and the same professions, the dps one person does can not be compared to the dps another person does due to: reaction times, players skill, connection speed, etc.
That being said I copied my own character, and if what I find is invaluable to you because of that, so be it. My character on live is a 507 mastery arcane mage. I changed out to get 5 piece T15.
Just using our brain cells we can tell that mastery has no purpose in an invocation arcane build. The reason mastery was so powerful was because players were above 85% mana on live which is not possible on the PTR. Hence the only option for our primary secondary stat would be haste. This leaves us with two questions. Is that value of haste such that 2 haste>1 int? I decided that since almost every class that has haste as its primary secondary stat has 1int>2haste (think frost or spriest) that I would follow suit. Second question is which is the worst secondary stat, crit or mastery. I had decided that since my gear was from live, which virtually has 0 crit on it, I wouldn't be able to do a valid haste/crit build, so I went with Int>>haste>>mastery>crit. As such red gems went int, yellow went int/haste, and blue went int/hit. I also went with frost armor, not mage armor.
Once that is figured out, there are basically 3 different arcane styles you can play between invocation and rune of power.
The first style is burn invocation (evocation>NT>AM (when arcane charge>=4)>AB until mana is gone then repeat with evocation.
The second style is burn/slightly negative invocation where you use the burn evocation play style when cool downs are up, otherwise you slowly drain your mana as to only evocate when invocation buff is about to wear off (AB to 2 or 3 stacks, use whatever AM procs you have then Abarr).
The third style is burn/conserve rune of power where you burn almost all you mana during cooldowns, then use a mana positive rotation so that you are back to full mana by the time your cooldowns are back (AB to 2 or 3 stacks, use whatever AM procs you have then Abarr).
Play style 1 and play style 3 led to almost the same numbers, play style 2 was 5kish lacking.
I would like to test our fire, but again my gear has very little crit that I don't think I could make a valid comparison.
I think did 2 more tests as frost, both using invocation, one with frost bomb, the other with nether tempest. Both frost bomb and nether tempest beat out any of the arcane playstyles by approx 10k, with frost bomb being a little better.
Edit if you want exact numbers, no cleaving
1) 93k dps
2) 91k dps
3) 95k dps
4) 110k dps (frost bomb)
5) 105k dps (nether tempest)