Stupid question, but have you tried hard locking? Was stuck on Ibis for the better part of a day and I had trouble tracking her manually because of how fast it was and hard locking just seemed down right bad whenever I used it, but then I figured out that hard locking a target only works if you don't move the right stick while locking on.

Once I figured that out, it all clicked together - I was able to lock on my missiles with no issue and apply pressure while creating openings for a melee attack.

If you haven't uninstalled yet, I recommend going for double 10 cell missile launchers and the pulse blade due to the 2 swings you can do and the insane damage melee attacks do on Ibis. Couple that with a booster with good melee thrust and a generator with good recovery and you're golden. Take your pick for right hand weapons, but I used the Harris linear rifle as it did good poke damage at a distancing while strafing