To continue your High Spit/ Low Tiff example.
A spitfire in that situation doesn't have the Tiffie cornered. The only way that Tiffie is in trouble is if he just got out of a fight and is going 200 mph. Even then he can probably still get out of there unless the Spit pilot really knows what he is doing.
Lets say the Spit pilot is doing 300 at 2k, and the Tiffie is going 200 at 100 feet. After the Spit gets done diving on the Tiffie, he'll be doing ~400 mph. Hopefully, our hero in the Tiffie has seen the Spit coming. Lets give Tiffieboy 30 seconds of knowing where the Spit is. So in that 30 seconds, Tiffieboy endeavors to do a couple things.
First, build up a little bit of speed. The Tiffie could probably get to 250-270 in 30 seconds, from 200. I'm making a guesstimate here, I don't fly the Tiffie but I know it accelerates pretty well.
Second, get in a good position. If Tiffieboy has any sense, he won't try to run AWAY from the Spit... he'll run TOWARD the spit. He'll get himself at the Spits low 1 or 11, and get ready to engage.
So, now we'll get to the Spit. The Spit sees this low slow Tiffie, and starts salivating while he dives in. The Tiffie sees him and starts coming towards him... he starts drooling. He sees that the Tiffie is going to pass close under him on his 11. So, he banks left, steepens up his dive some because he wants to get that shot in.
Tiffieboy sees this. Actually.. Tiffieboy has seen this so many times before, he could do this part with his eyes closed. He judges the Spitfires speed, then pulls up to "duck" the shot when the Spit is at about 600 yards. He then rolls to place his lift vector where the Spit will come out from behind his tail, if the Spit continues that "diving turn" in an attempt to come back around on his 6. If the Spitfire stays in the turn, he is going to eat 4 Hizookas. If the Spitfire comes around hard in a loop, Tiffieboy will roll his lift vector back towards the Spit and do a loop too. And then the Spit will eat 4 Hizookas. If the Spit does none of these, but instead tries to set up for another pass, Tiffieboy levels out and hauls ass. The Spitfire might get another chance at it, but it is very doubtful. I know this because Spits can't catch a 190a5 after a manuever like that, and the Tiffie accelerates better than the a5, and is a good bit faster.
You don't really need to bleed off all your speed yanking all over the sky trying to dodge a BnZers pass. I'd guess I probably lose about 20-30 mph in a typical dodge, but I also dodge vertically upward, so if they try to set up for another pass, I can nose back down to regain my lost speed.