Perhaps consider the future shooters you need to encourage and excite with FT?? Making a course really hard may very likely discourage new shooters (or even folk returning after a long break for whatever reason).
I still think adding a 3rd target for a portion of the lanes just for AAs (25mm at 55, 15yd standers at 35, 45 and so on) would push most and of course anyone could elect to have a go at them. AAs need to encourage new shooters especially juniors - there are way too few. It might impact their grades but I'm sure hey will bounce back :-)