Right now, on the 3 courses I typically play, there is really only one flight I'm missing: a disc with the flight of a TeeBird (a new DX Teebird, or a slightly less fading Firebird) that's longer. Maybe a distance between the Beast and the Tern with a gentle (maybe 1 or 2) fade.
This is where it gets tricky. Everyone wants a super long straight disc, like a 0/1 flight. Why don't they make it?? Heh because it's nearly impossible and it really depends on your arm speed.
The faster a disc is rated...the wider its rim, typically the more finicky they get at different velocities. If you throw it too hard then it will turn a bit, if you let it slow down it will fade no matter its fade rating. Wide rims just do that.
Also, the less turn a disc has the less "easy distance" it has. The Tern bombs because it gets some, well "tern" to it and then has a mellow finish. If you want more control then you will have less turn and a touch more fade, and this will mean the disc seeks the ground sooner and you lose distance. So even a similar speed class disc with a more trustworthy flight will lose 25' or more distance for many players compared to a Tern. It's the cost of consistency.
So basically you need true power to get that straight to fade flight, no matter what. The options are either get a fast disc that's on the verge of being understable and it'll get out there on speed without really turning yet, or throw a milder speed 7-9 disc that you can overpower and have it hold a straight line and barely fade. I personally think the slower disc being overpowered has more control for the most part, especially while figuring this out.
This is where I still recommend a Gstar Teebird for you, it will definitely be shorter than the Tern and even your DX Teebird, but it will be controllable and fly just as you throw it. But the harder you throw, it will keep flying like a Teebird, just farther. They add distance as you add velocity, unlike a very OS disc that will want to fade soon or a very fast disc that will add distance and turn.
If you go up to something straight-ish in the speed 11+ range, say like a Trespass, it will fight wind better and plow through bad form throws easier, but if you power it down at all it will fade like a fade 3 high speed disc and give you some sweep and maybe skip finish. When you can overpower a disc in this speed range it will be very controllable and give you a very mild flight at a farther range than a Teebird...but if you're having to crush on it then it's not going to be as controllable. Let's put it this way, if you can throw 350' very easily then I would say Trespass is a fantastic bet for being neutral and glidey. But if you can't easily throw a certain distance, no disc is going to give you a 0/2ish flight and distance...it's all on velocity to power a disc straight out there. Think about how your Teebird livened up once you could throw it harder.
