As for the lenght, it's perfect.
Regarding the elasticity, I will make it do.
This type of "strenghtening", is the first time I do it.
I think I have the basics down though. (Lit. But the basics, I do not think they are wrong)
In short, I will keep on compensating and reach the perfect thing. (lit. The point is: I will pile up compensation over compensation and reach the perfect thing, that is what it's about.)
Moreover if it's This, I will use what he had as a reference. (lit. If it's This, from what he had I will use it as a reference)
In addition, if it's about magic power it has been flowing through my body for quite some time.
What's left is to keep on repeating the process.
I think it's used when people want to talk about something they know and is known with the audience but the author does not want to make it clear until some time later.
Am I right?
He is referring to a bow since he is talking about an archer.