Your like me :), sadly not all my weapons have that perfect sight (anything without zoom I consider perfect lol)
Can confirm that flying, no sight, Dahl stock, Dahl grip is possible legitimately. My shock one is all of the above, except Flying, which I have pulled previously on another.
dude what are you doing to me, lol⦠I lose sleep over parts and prefixes, now no parts 
I donāt know that much, but what I do, is see what prefixes and parts (by picture) molmf & derch use, then I know for sure its the best s*** if I have the same, otherwise I trash it! lol.
Be aware that a lot of it is personal taste though, and a specific combination of parts might be 98% as good as what Derch or MOLMF are using, so they are worth keeping.
Rule of thumbs:
- Matching grips are not always the BEST choice, but they are always a GREAT one
- You rarely go wrong with a damage accessory
- Stocks donāt matter as much as you think
- Sights are almost completely personal taste
Iād add this to your third point:
āStocks donāt matter as much as you think - but Dahl is usually the best, when availableā
I think everybody can agree that a Dahl stock on Assault Rifles, Sniper Rifles and SMGs is pretty much the best possible option, even if they donāt matter that much, no? Choice of stock gets trickier when it comes to shotguns, but when it comes to those other weapon types, Dahl is the go to choice (and Jakobs is usually the worst for ARs, SRs and shotties).
I agree completely with everything else you said.
Why are Dahl preferable? 
Best recoil reduction
Although for SMGs and snipers with a high fire rate I kinda prefer Hyperion
If I recall correctly, besides recoil reduction and accuracy recovery stocks also influence weapon sway. Iām not sure because Iāve lost the link to the post at the old forums.
They have a great balance of desirable traits and no noticeable drawbacks
I have a PERFECT Torgue spitter with Torgue grip for fast reload and 50 round magazine and it has the Dahl stock. It really does reduce recoil a lot compared to the Bandit stock I had on the last spitter I had. Plus itās cool looking. Not as much of an an issue on SMGs but still, youāre lucky if you get one.