[excession]

the UA's check aggression on each street, TA just checks the flop - the .1 is just to make sure that folks who have zero rating on turn and river ( don't have enough hands there) fall into TN/unknown

the ignoring 100% Vp$iP has the same idea - to avoid rating those with only a few hands played, although of course if you rate after 20+ hands like most folks this won't be relevant