Thank you all for your answers.

I think I am kind of avoiding the psychological problem of holding out my trade for runners, being very inclined to reduce risk whenever possible.

I am by nature a very risk adverse person, and wouldn't actually mind sacrificing some profit just to lower the variance of my trading.

That said, I believe this is actually a psychological problem that I would have to address soon - if I truly want to be a really good trader.

I am experimenting with a discretionary style of exit, using order flow/price action/support resistance zones to determine a suitable point of exit. It is extremely difficult to say the least - much more difficult than finding a point of entry. I guess I'm starting to understand professional traders when they say you never truly master the exit.