A bonus to light armor hp (5% per level) would be a good idea, so only for ferro and reactive armor HP (no bricking with standard plates).
Standard plates could get a slight reduction of their speed malus per levell, so that you get like 3% malus instead of 5% at proto.

This would be a good match to lore, so the amarr would become the brick scout. I'd dump the stamina gain for that.

A reduction to armor plate speed penalty per level!

If its gonna be slower than a min assault give it a bonus that basically turns a complex plate speed penalty to that of a basic plate or a feroscale. And keep the stamina bonus.

Personally I think this would rock cuz lets face it, it's slower than a min assault and your gonna put plates on it and feroscale plates suck, so either reduce its speed penalty from normal plates or the fitting cost of feros.

It's a armor scout so your gonna use plates at least one then your gonna run at least one kinetic that probably will barely give it a sprint speed of 8 and if you tank it it's gonna be a mini heavy with stamina lol.

Give it a CPU pg cost reduction to fero plates or a speed penalty reduction to armor plates either or I think is a good addition to the stamina bonus or a increase to armor repair per level since the shield depleted delay and recharge are so low and it doesn't have a passive rep like gallente that makes up for the slow recharge an shield depleted delay values.

So you want to make the plates with the lower speed penalties, which exist specifically for this exact situation, redundant.

You know what the bonus should be?
Infinite stamina at lvl 5.
Stamina is not valuable enough to see a 25% increase and go "wow". It needs to be at least 100% and even infinite wouldn't be broken.