It's getting to the point...as it usually does, of beating in a disc to hold the lines as apposed to getting new plastic that will fly that way out of the box. It's weird I know, but my beat z avenger 174g will hold a smooth smooth anny the entire way when thrown flat, and i only have 350-375ft distance. I like what was said earlier about looking at the rest of my bag...I was so focused on these three discs, when I should have been looking at another one. My flow. Can get max distance, can be understable/overstable based on plastic, wear, and weoght, and can take over that surge part of my bag. The saint and avenger could in essance stay in the bag, removing the surge, and using the flow in its place....but then again, my flow has way more glide imo than my surge......I'm definately overthinking this now. Lol
How many Flows do you have that you're basing its stability on "plastic, wear, and weight?" I've HAD a few, and they can be all over the map in terms of consistency in the mold. For this reason, I think the Surge is a safer bet.
You do seem to have a lot of overlap in the driver category anyway, especially where you have multiples of most of your discs in what I can only assume are different stages of wear. This can get pretty convoluted. I kind of go against the grain in that I don't have multiples of a disc with different levels of wear, but instead have specific discs for specific uses. The fact that all my plastic is now either champion, opto, elite z, or vip makes it basically impossible to try and carry one mold of anything in different stages of wear.
Anyway, it might be best to decide on some and eliminate others, at least for now. Not easy, but it will help simplify things and aid in consistency.
The River is a magical disc, but don't count on it for control. Any wind and any River becomes squirrelly. That's where your Saint can come in handy....control. The Avenger is an old tech driver with what I consider a funky rim. And you don't really need Avengers if you have Predators. The Force requires a lot of power to fly right and is almost certainly too much disc for you at 350 ft distance. Stability-wise, there is major overlap for you with the Predator, Avenger, Surge, Flow, and Force...all either overstable or power hungry drivers.
And I still find it curious that at 350 ft of power, you're easily able to anny your Avenger and Surge all the way to the ground. How far out is that happening? And is your right shoulder winding up much lower than your left at follow-through? A beginner, at relatively low power, throwing all power hungry overstable drivers is a recipe for OAT. Don't do it! Get at least one neutral-understable driver in your bag and learn to throw it in order to make sure you're using proper form. And the River ain't no driver. It's an oversized fairway driver...just to make sure a whole new line of dispute doesn't develop over that one.
You need to simplify things and NOT try and throw all kinds of drives with one kind of driver(i.e overstable). It doesn't matter how beat up they may be, that is all wrong.