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The propulsion generated by Silver Crow's wings is completely independent of his avatar's muscle power. That is, his muscle power factors into the speed at which he punches and runs on foot, but his wings determine his flight speed.
We know that Haruyuki has devoted upgrades to improving his avatar's speed and flight time (ie: reducing the SP-cost of Aviation). The grammar of the translations leave it unclear if he has improved his flight speed, body speed, or both.
Since body speed is determined by muscle mass (among other factors), improving his running and punching speed would require increasing his muscle mass, which would increase his weight and toughness, as well as the weight and strength of his physical blows.
While that might have happened, it doesn't seem so.
Improving his flight speed would mean upgrading the propulsion generated by his wings, which provides no benefit to his speed at all when not using Aviation. Since it was Kuroyukihime's advise to focus on his wings alone, it makes sense that he would choose to improve his wings rather than his whole body.
But further, it's possible that flight speed and flight time can be improved through the single factor of cost. There are at least two ways to improve Aviation's propulsion by way of cost.
The first way is to allow Silver Crow to spend more SP on the ability than he could before, to achieve greater speeds than before. Basically, upgrading the upper limit of his fuel-to-power conversion rate.
As an illustration, I think that he can use a full Special Gauge to travel at top speed for 15 minutes. But by increasing his conversion rate, he could possibly achieve orbit in 1 second by blowing all of his SP at once.
The numbers are probably wrong, but that should communicate the basic idea. Namely, that there is a limit to how much SP Silver Crow can spend on flying power from second-to-second. His "engine" is capped.
But, while that would definitely improve Silver Crow's flight speed, it wouldn't actually improve his flight time. The opposite method would do both.
If Silver Crow instead had the option to reduce the cost of Aviation, he can achieve the same levels of propulsion as before, without having to spend as much SP as before.
If he could originally use a full Special Gauge to fly at top speed for 15 minutes, this could allow him to fly 15 minutes at the same speeds while still having SP left over, or to fly at the same speeds for a longer period of time.
This doesn't directly improve flight speed, as you can see. Flight speed is only improved indirectly, in that Silver Crow is more free to achieve his top speeds without worrying as much about the costs.
That is, if Silver Crow wanted to be cautious about his SP, as when expecting an ambush while traveling the Unlimited Neutral Field, he might spend 15 minutes flying at only half speed. He doesn't cover as much distance, but he conserves some SP.
With an upgrade to improve the economy of his propulsion, he could afford to travel at full speed, because he would still have some more SP left over than he would before.
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