When it comes to CPL nav (or even PPL), as bingofuel has already stated, try not to constantly feature crawl.
Don't try looking for small details look for larger (the larger the better). As you're probably aware, it's good to pick features every 25% of the route as well using fan lines.
Set your heading and stopwatch and........wait. Wait until your first fix and check your position. The fewer fixes the better, as it's more obvious when you're off track.
If you attempt to check your position every 30 seconds, you'll almost certainly fall foul of confirmation bias as you rapidly move on to your next fix barely a couple of miles away. The added distraction will prevent you from maintaining heading and altitude....then it goes from bad to worse.
Set heading, set stopwatch.....trust your heading is correct, adjust as required.
The less you do between fixes the more attention you can pay to maintaining you heading and altitude and the more accurate your flight.