Sylph.Bonaparte said:
...is it still worth upgrading to oa2-4 times and use footwork ...
To answer that part of the question:
In order to determine whether it would be worthwhile to upgrade the Ursine Claws +1 to +2, I have conducted a limited test using my own character and my brother’s, in which I used the +2s, while my brother used +1s. While using no other gear besides the weapon and both having 100% similar MNK merits (5 Kick attacks), we hit some campaign fortifications.
The results are as follows:
Ursine Claws +1 (no DMG OA2-3) – 261 attack rounds, 444 hits (includes misses, 95.95% acc)
Ursine Claws +2 (no DMG OA2-4) – 269 attack rounds, 463 hits (includes misses, 95.03% acc)
Normalised this translates into:
Ursine Claws +1 (no DMG OA2-3) – 100 attack rounds, 170 hits (= 70% double attack)
Ursine Claws +2 (no DMG OA2-4) – 100 attack rounds, 172 hits (= 72% double attack)
The difference is not significant given the relatively small sample size (got aggro from a campaign boss lol). The preliminary results hint at a 2% increase in double attack rate, though further testing would be advisable.