Patience.
Let the aircraft settle down at the top of climb, and take the time to trim it properly. This frees you up to look out and think ahead rather than chasing the altitude all the time.
All too often CPL students think they are in a Warrior or Tomahawk, get to top of climb, power attitude trim, and then 5 mins later they are gaining hundreds of feet and wondering why.
In an arrow, it takes time to accelerate fully to 120, and taking the extra time to trim properly pays it's dividend.