Exactly.
From the OP:
He isn't asking for opinions about what disc to use that would allow him to do whatever he wants it to do, but rather a disc that he personally can "get a full flight" from without imparting too much OAT. In other words, he is asking about a disc that, for his experience and power, he can throw correctly for the max distance of said disc. If he is only throwing the Wraith 300', that is absolutely not the full flight potential of this disc. It is more around 400-450', or more for the Wraith. But, a Leopard, TL, Cheetah, etc is more applicable for his current potential; not his future potential, but current.
In addition, throwing these slower discs just as garublador stated, will allow him to become better faster, and ultimately train himself to throw faster discs to their "FULL FLIGHT" potential with proper technique. I agree with you, prerube, that the amount of snap imparted upon the disc is much more important than the speed of the arm. But to acquire maximum distance, you need to have both. That is why I can throw my TB to 375-400' and my S-PD to 440' or so without a whole lot of arm speed, because I snap the hell out of every disc that I throw (by pinching as hard as possible with my thumb and index finger, and accelerating through the drive as taught in the More Snap vids). I am a bigger guy, but the people that I know, including the pros that I play with regularly, always state that they can't believe how smooth of a driving motion I have and it appears that I'm not putting anything into the throw. If I start throwing with too much arm speed, my timing suffers and ultimately the drive fails. This is also why I suggested watching the More Snap videos, because Bradley Walker (the narrator of the videos) states how important that snap is compared to arm speed.
If the Wraith worked for him, and he also stated that he was using it for different types of lines (like you do), etc., I'd have suggested a Surge, PD, etc. But the fact of the matter is that wasn't what he was asking. For a "full flight" disc, he'll definitely need to go slower, and I commend him for having the maturity and humilty to not let his ego in the way so that he could realize this on his own and ask his question on this forum.