[Transmuting For Rare Mods]

Over time I generally accumulate large numbers of rare mods that I don't need, so naturally I try to transmute them into ones that I do need.  A moment ago I did seven transmutes with only rare mods.  The first two transmutes gave me rare mods back, but the other five gave me crappy common/uncommon mods.  Is there perhaps a limit to the number of rare mods you can get from transmuting per day?

[Is This Still The Boltor Prime Forma Plan To Follow?]

This page: http://warframe.wikia.com/wiki/Heavy_Caliber convinced me to replace heavy caliber with more elemental.  Thoughts?

[How Is Mirage's Crit Calculated?]

I have been playing as Mirage with a potatoed soma lately.  With mods I have the soma's crit up to 75%.  But a peculiar thing happens:  Against some enemies - but not all - the soma will do 5-10 thousand red crit when Mirage is in hall of mirrors mode.  When hall of mirrors is not activated, it's back to the expected amount of yellow crit.  I can confirm that this is not just a graphical glitch - this red crit damage will plow through a T4 corrupted heavy gunner like a butcher on Mercury.  

 

So I'm hoping somebody can tell me where the crit boost in hall of mirrors comes from and how best to exploit it.

[Rifle Ammo Mutation]

I'm wondering where the best place is to farm the rifle ammo mutation mod.  Preliminary googling suggests that this can be found as late rewards for survival missions, but the posts are old and it is not clear which survival missions are best.  Anyone know?

[T4 Exterminate Keys]

Can you estimate how many waves you've had to wait for T4 ext keys on average?  I've gone 8 waves before my first T4 key of any sort appeared.

[T4 Exterminate Keys]

It is no secret that T4 exterminate keys are rare: they are among the most requested void missions in the recruiting chat.  But I'm growing concerned with exactly how rare they are.  I have been farming T4 keys for days, with an emphasis on the lower level keys (exterminate, mobile defense, capture).  After all this, I now have 10 capture, 7 mobile defense, and 0 - not a typo, zero - exterminate keys.  

 

If all keys were equally likely, the chances of this would be about 1/1000.  Even if capture and mobile defense are twice as likely as exterminate, the probability only goes up to about 1/50.  So my questions are:

 

1) Can others confirm that T4 exterminate keys are substantially less likely than the other T4 keys?  If so, does anyone know why?

2) Are there specific mission(s) that are more or less likely to award T4 exterminate keys?

3) Do the probabilities depend in any way on the number of waves?

 

Needless to say, this is rather frustrating.

[Mastery 8 Test]

I just failed the mastery 8 test for the second time (the only test I have failed).  I have no trouble shooting orbs while horizontal wall running, but two things are happening:

 

1) I wall run towards the vertical platform, jump off the horizontal wall and sail right past the vertical wall.

2) Sometimes I jump off the horizontal wall and head towards the vertical wall, but when I hit the jump button upon reaching the vertical wall nothing happens.

 

So I am obviously doing something (several things?) wrong.  Can someone tell me the exact key presses that are required to pass this bull$#!^^ test (which, by the way, has nothing to do with the actual game)?

[Ash/bladestorm]

Well, it sounds like this is settled - thanks!

[Ash/bladestorm]

I have some questions about Ash's Bladestorm ability:

 

1) Where does the XP gained from Bladestorm kills go?  Is it all to the warframe, or some to weapons?  (Actually, I'm wondering the same thing about Valkyr's Hysteria ability.)

2) Is Bladestorm damage affected in any way by the stats of the equipped melee weapon?  

3) If question 2 is answered in the affirmative, will the Finishing Touch mod improve Bladestorm damage (since according to the Warframe wiki each attack inflicts finisher damage)?

 

Thanks!