I'm wondering if maybe this is not just a big deal about nothing , I hope at least you're enjoying FTA instead of being annoyed by these TP's , I'll explain Why .....
What type of LNB are you using ?
What Satellite is this occuring on , is it a Circular or Linear signal ?
You know I believe I experienced the same results as you , but left good enough alone.
It all happened one day while I was on the motor control on my CS 5000 , I was fine tuning a particular TP that had low quality signal , after saving my position I went to my channels on other TP's only to find I had lost signal strength on them, after doing this back and forth several times I decided to leave it on USALS that I had originally for motor control, I found that I was dead on for 99% of birds on the ARC and that my adjustments could not correct what I thought was unnatural.
In fact I once posted a Wild Feed Find ( long ago ) SBS 6, and remember members here not being able to get it , until one member posted he made an adjustment and it came in fine , I also remember playing around with IA-6 and making an adjustment east and blind scanning , I found a Soccer Feed that seemed out of place , I don't know what happened but it was as if the signal coming down was so wide that my dish was just missing it , but short of being from another bird.
I hope you can enjoy your FTA setup and not lose sleep over warped dishes or Focal Distance , because even with all the right answers it might just be something that may seem unnatural but isn't.