%dmg is generally fine, but I generally feel like you can get slightly better results with a different stat. 10% damage on a weapon when dual-wielding is only a 5% gain, and even less when you take into account the damage range rolls I recommend picking up on your rings.
With Oathkeeper, you pretty much always want AS, since this pretty reliably helps you gain a breakpoint, plus CDR, to help with WOTB cooldown. The third roll can be a variety of things… I think it is extremely helpful to have a LpH roll on one of your weapons, so that can be the 3rd roll on your Oathkeeper, if you don’t already have it on the other weapon. If you do have LpH elsewhere, I would generally give AD a slight priority, but %dmg is certainly good too.
The other weapon, if Azurewrath, then would have CDR/Cold%/ and either LpH (if not on the OK, or another roll of it if you want to heal real fast) or AD or %dmg.
If the 2nd weapon is Echoing Fury, then it always rolls with dmg% / AS / Str. In my non-season push I opted to roll Str to LpH, but a more optimal situation would probably be to have LpH / CDR / AS on my Oathkeeper and then dmg% / AS / CDR on the Echoing Fury.
As for hitting the 5 frame breakpoint… I don’t think this is possible. Even if you take AS from Enchantress (Focused Mind) and have it on both rings, and your gloves, and have Frenzied shrine, you still are at 6. Of course, if you pick up all those rolls and take Echoing Fury, you can get down to 4.5 frames!
But, that still isn’t really optimal: you’re better off taking CDR rather than AS on at least one of the rings, as this can get you very close to 100% uptime on WotB (99.42%) once you get Empowered Shrine. And even without those two AS rolls, Echoing Fury still takes you down to the 5 Frame breakpoint.
Actually, EF adds so much speed that you could actually drop AS from your gloves as well, and not take Focused Mind from Enchantress, and take a different roll on your Oathkeeper, and still hit the 5 frame breakpoint.
Anyway, I think you get the idea- there are lots of possible rolls you can take, and luckily, most combinations are quite good!
I hope this was helpful. Good luck on 150!