@SkyJayTheFirst
That's the way aerodynamic work anyway, you can't PSM at high speed, not with wing loading this low anyway.
The flat bottom should still be there because it's unmatched (and probably no substitute) high aoa characteristic and you should workaround it instead.
If you use semi-symmetric, you can PSM at high speed but tumble horribly, I'd rather not PSM at all.
I know there are overwhelmingly many things to play around so I suggest you to pick the design choice base on it's unique capability that no other part can cover rather than how easy it is to make.

@GuyFolk alright, I'll fine tune the pitch rate to be a bit higher, then. Also, I did try using flat bottom wings. Problem is, when I did, it no longer wanted to do PSM unless its speed went below 500 mph. So, at least with the middle and outer wings, I had to stick with semi-symmetric so that it could still PSM at above Mach 1.

@SkyJayTheFirst
For pitch rate, you can test it by pull up and if the plane resist that's mean you are on the right direction but may be too much of *0.00x (pitch rate multiplier).
Most of the time if pitch rate is implemented correctly, the plane will stop pitching on it's own at some speed but if it's inverted it'll be amplifying the pitch all the time and once it pulled up it'll never stop.

For roll, have you use flat-bottom wings as I said before?
If not there will be problem with roll at high aoa and that'll hurt it's PSM capability.

Also, vertical stabilizers can induce roll at high angle of slip.

@GuyFolk when you can tell me, is there any advice you have for me about the roll rate? Whenever I do a PSM with the aircraft, sometimes it likes to roll upside down or sideways, and I can't figure out why. The actual aileron is doing it.

@IceCraftGaming trying to fix that as best as I can. I'll see what I can do with the next version. Thanks!

It tends to pitch up

@GuyFolk just tested what you said, and you were right. Now the yaw rate is working properly on 0.01. However, I'm not sure what to do with the pitch rate, as I don't know how to tell if it's inverted, or not.

Roll rate seems fine, but it sometimes likes to turn the aircraft sideways after doing a PSM for some reason, and I tried messing with the number on that, and changing the plus sign to a minus. Why would that be happening?

@SkyJayTheFirst
I think your performance range is too wide so you need to work extra lol.
But that's possible, with time.
For yaw, that surprised me for a sec but through the process of elimination, it is just common mistake.
The plane shaking sideway at first look like the yaw rate is too sensitive for an inexperience eye but it is actually not, yaw rate normally is not above 30 and the multiplier behind yaw rate is just 0.002 so yaw rate is definitely not too sensitive so it is not sensitivity problem.
So (YawRate0.002) is out of the question, only thing left is "+" in Yaw + YawRate0.002.
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Conclusion, yaw rate is inverted.

@GuyFolk you might be surprised to hear this, but if I had the yaw rate literally any higher, it would shake the plane sideways and out of control. Roll rate seemed to have plenty of control on my end, too. Pitch rate, I'll probably fine tune in the next variant, though. Thanks again for your input!

Fly much better.
I suggest you change wing airfoil to flat-bottom because it have the best high aoa and stall characteristic. (it eliminate roll inversion at high aoa which should not be present in modern jet)
And I have a good and/or bad news, the plane fly smooth not because FT code you use but the plane was nicely tuned before.
Because you multiply the rate by 0.00x so the actual value use to calculate in code will be so tiny it basically not affect the input.

@donkski thanks! I had no idea I could even do that.

@LaylaSP1 wait, was that genuine, or was that supposed to be condescending and sarcastic?

@LaylaSP1 even while exceeding mach 1!

It can perform a PSM, good job!