I had Benchmade MPR doing exactly the same thing as this Strider. I don't think that bending the lockbar will help much. There still will be some play, just not as evident. Blade stop needs to be enlarged. I don't know how Strider does this, but I would think that removing the old stud and press fitting a bit bigger one would be a perfect fix.
Back to that Benchmade MPR. I'm very happy with the hex design of the blade stop. After taking knife apart and turning blade stop to where thicker side makes contact with blade, I fixed the same kind of play. Now it is absolutely perfect. I wish ALL makers adopt the same stop pin design. It is so much easier to take the knife apart and turn the pin, rather then dealing with sending the knife in for repair.