Is it better than the AI we have now?
In a word, no.
You have spectacularly failed to produce rules for a working AI. It is more dependent on bonuses than the existing AI; it is less competent tactically than the existing AI; and it is more predictable than the existing AI. It is an awesomely poor idea. It is so bad, that for centuries to come it will be legendary amongst AIs for its immense rubbishness. It's really that bad. It is mechanically broken, conceptually lazy, logically inconsistent, astoundingly unconvincing, and totally predictable. It is inferior to the existing AI in almost every single important metric, and the existing AI is pretty bad. I strongly advise you to just drop it and move on rather than starting extra threads to draw more attention to what a stupid idea it is.
Marigoldran, it's becoming increasingly clear that you simply don't have much experience in fighting a war in this game. I wouldn't be remotely surprised if you've never actually tried. Oh, you've gamed your way into an early transport fleet, then moved them all to defenceless worlds and invaded them, but you've never continued playing long enough to see the AI actually using fleets. You've declared victory by turn 100 and stopped playing, at about the point where the AI has maybe 50 ships. This leaves you singularly unqualified to pass judgement over how the AI operates in a war.
I suspect many people reading this are somewhat nonplussed by your apparent belief that 5 fleets represents a major invasion, tbh, since I usually have more than that hanging around on the quiet stretches of my border by the time the AI has finished colonizing; there's never a point where the appearance of 5 fleets on my border couldn't be matched by an equal-or-greater force within 2-3 turns. It's not exactly hard when most industry worlds can generate enough production for a fully-equipped huge ship every turn.
You also seem to be labouring under some fairly massive mis-conceptions about how warfare works. For example, a fleet is not a concentration of units. A fleet is ONE unit. A tactical combat is what happens when one unit attacks one other unit. A battle is what happens when many units gather and fight multiple tactical combats until one side or the other is dead. If doomstacks were in this game (and, in fact, they are, it's just the AI doesn't use them), then they would be made up of stacks of fleets, not stacks of individual ships. Ships are really just equipment slots for a fleet. An actual concentration of force is where multiple fleets are gathered and work together to achieve an objective, which is exactly not what your AI has been ordered to do. You are, in fact, sending units at the player one at a time. Those units are full-logistic fleets, but if my units are also full-logistics fleets then you are still just sending lots of scattered individual units at me, to be annihilated by my own. This is incredibly basic stuff that you don't seem to have figure out yet.