Could it be that you are subconsciously throwing the 163g differently than the 175g viking? I have owed 3-4 vikings in the past 2 years, all few similar to eachother and never had one that faded anywhere close to a firebird unless I eased up on it, alot...
And BVD is correct, you lose a conditioned disc and then get the same one off the shelf and realize it's nothing like the disc you lost. well throw it at least 20-30 more times before making any judgements. If I threw every disc less than 20 times before passing judgement on it, I would be throwing a 132g #1 Hyzer as my main driver now with almost zero Innova or Discraft in my bag.
Also, maybe the disc isn't exactly the way your old one flew, but hey, you'll learn what that current disc will do and use it to fit your game, not force the disc to fly where it dosent wanna fly.
The champ valk I have now is nothing like the one I bought off the shelf 6 months ago.
And Sam finally makes a good "Innova-Kool-Aide" induced comment about the backups in the bag already and knowing what they do before starting a round... never have a disc that you don't trust in your bag for a round. Save it for a practice day where you will give it the attention it deserves to learn what it does for you before using it on the course where it counts.
wow, just previewed this and i feel like my words just runnn my toungue out of my mouth... good thing i can sign it...


Edit: All my vikings have been 169-172g, just for the record... And i parked a hole here in rocklin that I have never been able to park before, thanks to my 170 viking...