The design of that A-arm with what appears to be a butt-welded 45 is weak, IMO. If you must use welded A-arms, why not use the same kind of design as was used on the other side of the A-arm? It's stronger, and more importantly, easier to achieve a strong weld.
Also, I assume that since you are using CrMo, you know about the requirements for pre- and post-welding heat treatment?
If it were me, I'd get the arms X-rayed before I fit them to the car. Or better still, re-redesign the arm entirely to avoid the inherent design weakness.
Or maybe you could find a machine shop that could cut a set of well-designed billet arms?