I don't think the angle can be adjusted any better. They are sprites after all and not 3d models. What can be done of course is using code to adjust the offset and rotation of the animation. That's up to Xenoxols though.Little suggestions..
1.. the idle whip have a bad position the chain should be on the right side and no as it look now
2.. the whip no feel as a whip, why? dont have a feeling of distance between the player and the enemy (need to fix the sprite to give impresion of distance and also the tip of the whip need to be fixed with angle)
3.. maybe make the player able to move while attack kind of hard to stay hold until the whip is back to normal state
Anyway, swell work Xenoxols. I do hope you plan to add the chain whip "flailing" attack is it can be useful for killing creatures right in front and back of you (I have already done the sprites for that attack anyway).