Q: Bowstrings / Fletching / Money

I got from MTK about 70k of flax and after i finish to spin all flax (it will take some time) i get a bit more flax from MTK then like you see i targeting 80crafting level and it will be done when i spin last ones in this way.

Just i wonder what to do then with bowstrings (i allways want profit and exp :) i can sacrifice some exp earning speed if i do on it profit ), what is my best bet? I think possible choices:

I just want to say first then i not familar with fletching things so much and profit calculations and etc, almost of my fletching levels i got by making arrows...

1. Just sell bowstrings on GE;

2. (Fletching A type) To buy yew logs, fletch it to unstrungs, then strung it and sell it strunged;

3. (Fletching B type) To buy unstrungs, then strung and sell it on GE;

My opinion is to choose 2 choice, but i heard rumours then GE price is crazy for they and already are to hight - people not buy it, then maybye exists chance to sell it on RSOF like at old times with a bit lower then GE price..

Exp things i understand here, but how will change my profit with possible choices ? Like i get more money if i sell strunged yew longs for a bit lower price then ge or i can stuck with they?

I a bit calculated here:

a. from MTK i get flax for 40gp each, i spining by myself making it worth about 150-160;

b. then i need to buy Yew logs 350-400ea...

we get here 160+400 = 560, GE price is now 700+ gp each but i think for me profitable to sell it for 600+ or less then 700 gp each anyway and then i getting much more overall XP and more money? right?

Waiting for your opinion, i just know then i have no money to buy 70k of yew logs :) but then i will do it in few cycles, making it selling, making it selling :) & etc...