Panzer commander is not a static variable that gets added to the vision. It's a multiplier. Gets the vision all the way up to 72.5 or something like that (Tightrope tested it after playing against it and calling it extremely broken). Yeah, heat shells are mostly used for infantry and beefier tanks, nothing else. Maybe on snared or otherwise damaged tanks. I've seen a couple of 2 shots on tanks that were hit by a lousy mortar shell and got penetrated from above/behind, just enough for a 2 shot (something that you can't tell just by looking at the HP bar)
That's a crazy multiplier then... @ 50 sight it would be 1.45 (which seems broken) @ 48 it's 1.5 (seems more likely but still broken).
At any rate when I mentioned range I was speaking of the main cannon (not 70).
Tiger Ace also gets breakthrough and a sight bulletin (+10%) which bumps it up to just over 50 and that, to me, is about as much sight as anything that large should get. I wonder what a Command Panther (teammate) + KT + spearhead + panzer commander would do...