HW95 pellet experiment upside down

[Grover]

My new AOA HW95 22caliber has about 400 pellets through it now.  So being rained out at work yesterday, I decided to really go deep on some pellet experimentation and here are the surprising results:

Hatsan Vortex Express 13.12:  681 high, 660avg, 30es  @12.69fpe
HN FTT 14.66:  648 high, 640avg,  13.2es  @13.33fpe
RWS Super HP 14.2:  714high, 710avg, 6es  @15.89fpe
HN Terminator 16.36: 655high, 652avg, 8es  @15.45fpe

Then I did some groups at 14 yds in my garage.  Those results underscored the numbers.  The RWS and terminators were one ragged hole groups.  Vortex was worst at a nickel with one flier, and the FTT was a dime. 

My conclusion is that this gun likes the plump girls in the class with longer skirts (I'm the opposite, at least the skirt part. ). I even spot-checked some barracuda's in 18.21gr, and 19.09gr and both were consistent and generating close to 16fpe.

I had the hatsan vortex's because I found them on clearance at SG and I had a ruger at the time that did well with them.  I found more at Midway to add to my stockpile, but they sent them naked in a padded envelope.   Tins dented with some pellets disfigured, so no mystery there.  Guess there's a reason that they're discontinued. 

While I'm happy that I found the "Magic Bullet" in the RWS SHP, I am still befuddled by the FTT's performance in this gun since it's the pellet everyone says is supposed to do well.  So much so that I repeated the strings in abbreviation just to be sure.  Accurate enough, but dismal performer.

Has anyone else had similar experiences with pellet shapes/skirt thickness/weight with this or other 22 rifles?  I did snake the barrel out of box (no brush), and gun never really dieseled.

Any input/insight is appreciated.

Edit:  I should add that I compared the straight shooters site for numbers on the R9, and with the exception of the FTT, My results are about 3-4% higher velocity so the power plant appears healthy..