I think the to-hit % calculation on offhand attacks is pretty wack atm, too. Way lower than your MH attacks. I've also seen the % go down from first offhand attack to the second, from 5-10%. Free of any outside modifiers as far as I can tell, too.
The thought of three attacks every turn w/ Hex is actually scary, especially if they stick to how easy it is to get advantage for sneak attack currently.
