Dave,
Of the five (5) Rowan Engineering Extra set-back trigger blades I have in my HW springers, none has been any more 'wobbly' than the standard HW trigger blade.
In fact, as the pin is a much closer fit in the Rowan blades, they 'wobble' less.
If needed, you can use some M2 washers either side of the blade to take up any slack.
Have fun & a good Sunday
Best regards
Russ