OK - UPDATE.
I went out last night with just what I have in my possession. 4 different P/A discs and and 3 mids:
Mids
Star Mako (171)
Beat Up Pro-D Buzzz (169)
DX Wolf (176)
P/A
Pro-D Ringer (174)
Yeti-Pro Aviar (175)
DX Aviar (169)
GW Wizard (175)
Set-up: Aligned slightly left of the target.
Mechanics: I basically transferred my weight onto my back foot with a full reach back...and then rotate my hips and upper body and snapped as best as I could.
Result: Not a single disc made it the full 100' when aimed at the target and thrown flat. I added anny to all the discs a few times, and several kept the anny (Mako, Yeti, Wolf, Buzzz). The others landed "fluffy" and flat well short of the target.
I could easily reach the target with hyzer using all the listed discs but I don't have that luxury with the shot I am practicing.
I then tried all these discs again using a mild x-step...I saw a little better result but again, most of the discs hyzered well left.
I would say, by far...the best result I had was throwing the Ringer FH. The RINGER is really shallow inside. I would say about the thickness of my finger. The disc flew really straight with only slight fade at the end. at 100' feet I really felt like it was a shot I could consistently throw.
As a side note: I also have a terribly worn DX Focus(175), Gummy R-Pro Dart(172), a Star Dart and my beat up Soft Magnet (174). I didn't throw any of these in my test. Will try again with these as well.
I may simply just not have enough of a good snap on the disc to get it that 100'