[sy_or_bust]

You should stop thinking about this as a weak top pair hand. In a heads up pot your Q8 is a very strong hand, and figures to be best by the river.

Against an aggressive player I will often checkraise the turn. As you played it, I'd rather bet/call the river than check-call (better is probably checkraise). You can squeeze extra bets from donks with A-high and weak pair hands, unless you know Villain to be good enough not to hold QT or A7, etc. by the river.