I have a factory second Champion Thunderbird that is absolute money, it's probably my favourite disc in my bag. Max weight and it can take all the power I have while still being quite workable. I can work it on a lot of different angles and it's not too much work to throw it straight. It goes almost as far as my distance drivers and a full power shot will consistently land me on the 120m mark. (it's not beat up, it flew like this out of the box)
Now to the problem... I own three more Champion Thunderbirds that I got as backups and all of them are A LOT more overstable and dumpy. They're very close to firebird stable, definitely a notch more stable than my Felons and my PDs. They start fading much sooner than the money one, the fade is a lot dumpier and I need to really crank them over to flex them into a straight shot. The plastic on these seems firmer and more pop top, maybe a touch more domey.
What gives? Any insight to what is the normal? I used to throw Vultures and the money one is just a touch more stable compared to those, which is what I wanted, but the rest of the Thunderbirds.... yeez.