It really depends upon your needs, how many bushings to use, and where. I don't think that you imparted any additional "softness" into the arm, they are easy to tweak out of shape. On the positive side, they also tweak back into shape pretty easily, too. You have been very careful with this, and your setup for the press looked fine to me. I would use the arm I have, and just do some gentle adjusting of this arm, to realign the hole to the rest of the arm. If you find a suitable piece to put into the empty bushing hole for adjusting the shape, try to make it long enough to also use it for checking the alignment of the bushing holes to each other. Now you know why most mechanics dread front-end work.