There is so much metal on most of these frizzen toes, I never gave much though to bending them up some more. Sure, it can be done, but a little time at a grinder is a lot less hassle, IMHO. Bend away.
The other thing to check is the amount of " slop" at the pivot pin/screw- is there and sideways play in the frizzen as it rides the pin or in the bridle.
If so, a lot of bench rest shooters simply put a piece of soft leather between the lock plate, and the frizzen, using a hole in the leather " washer" to hold it between the frizzen and plate. A thin piece of leather won't prevent the frizzen from popping open, but it will slow Any forward motion after the frizzen opens. In fact, the target shooters remove the frizzen spring altogether, and use the leather washer as a brake on the frizzen's movement, only. :hmm: