This is so not thought-through at all, seriously look here at these stats you have provided (and fix it):
Old Bow now "Longbow" has:
Missile speed: 42, Weight: 3.4, Accuracy: 101, Difficulty: 2, Speed rating: 56, Missile speed: 42, Thrust damage: 25 cut, Slots:2 and Can't use on horseback, which not only is bad in itself compared to the other bows ( I will show you), but you have ALSO rendered my favourite bow - the BOW (not "Longbow") completely useless. 2 PD? It had 4, can't use my MW Bow anymore, it doesn't get any dmg buff from my PD lvl 7 & 8. Which it needs.
Then we have the new "Yonsun Bow", as an example, it has:
Missile speed: 44, Weight: 3.2, Accuracy: 102, Difficulty: 4, Speed rating: 58 Missile speed: 44, Thrust damage: 24 cut Slots: 1.
Now, look closely. The old "Bow"/Longbow requires 2 slots, can't be used on horseback, and is slower and has less missile speed. The new, Yonsun Bow, only takes 1 slot, weighs less, has better accuracy, better missile speed and 1 less cut damage. But higher PD req.
What have you been drinking? Water?
The old bow was a really nice medium bow, the first big bow you could buy and use, that would allow you to use PD up to 8, with a req of 4. Good investment if you prefer a bit more speed and less acc over more dmg and stability over the old RUS and LONG-bows. But now, it is all a big mess, that isn't any better.
Re-do, make right.