UnderDogs, we had this discussion about the importance of vision before.
I've just watched the (few) close games you had. Just some plays to think about:
http://goallineblitz.com/game/replay.pl?game_id=394495&pbp_id=7608529 (notice strongside throwing off both CB and your guy by early faking; didn't hurt - but still)
http://goallineblitz.com/game/replay.pl?game_id=394495&pbp_id=7612113(notice your SS falling for the pump fake, but catching up immediately for the QB needs too long to actually throw)
http://goallineblitz.com/game/replay.pl?game_id=394493&pbp_id=5734042http://goallineblitz.com/game/replay.pl?game_id=394493&pbp_id=5740060(this QB doesn't give the defense as much time to adjust)
http://goallineblitz.com/game/replay.pl?game_id=394495&pbp_id=7608649http://goallineblitz.com/game/replay.pl?game_id=394495&pbp_id=7611142 (this plays show that 55 vision is obviously enough to react quickly to a non-Pump-Fake, non-Quick-Release QB)
So far, the league your SS plays in doesn't seem to have decent fake builds. I saw some speedy TEs and some (low vision?) CBs getting faked out occasionally, but nothing serious. Mostly the CBs and the LOLB get outsprinted though... which gives your guy nice chances for PDs. Seems to be all speed/agility and powerbacks on opponents side.
Given, about 50 vision is enough to make almost all "normal" vision checks and the defensive coordinator likes to blitz the SS a lot, anything higher than 55 vision seems to be a waste. The difference just don't show often enough. So a SS is far better off pushing strength to 70+ and tackling to 60+ - together with 85+ agility and 95+ speed.
On the other hand, IF opponents field a bastard-QB with all Pump Fake (maybe even some VA Quick Release too?) along with Head Fake WR builds, that extra vision might make the difference.
So let the guys decide what path to choose. Saying 60 or 70 vision hurts just isn't fair i.m.h.o. - it's just a different approach.
b.t.w.:
http://goallineblitz.com/game/replay.pl?game_id=394495&pbp_id=7615721 (cover 2 when defending the 0.5?)