This is in a pre-manufactured home. All sinks and bathtubs are using individual air vent valves. Right now there is nothing beyond the existing drain pipe. Moving the drain pipe to the right might be possible. Is the advantage of doing that to eliminate tight turns, other wise I don't see why that would help? But I don't know much about plumbing, so I'm open to these great ideas.
Also, I thought with 1 1/2" ABS (which is what this is), that the trap arm had to be between two pipe diameters minimum to 3.6 feet maximum. I went to the wall only because that is the closest place that allows me to come up for the vent because of the tub bottom being in the way.
Thanks to you both for your help.