I was aware that a remote lockout lever wouldn't last as long as the original, but considering the price, I was willing to take the chance.

I'm not sure, but I suspect the original bolts are in steel, which would explain why they last longer. Before shelling out big bucks to buy titanium clamps + bolts from Asia (TWP, NovDesign, Kamoya, etc.), you might want to give SpedDial a try.