Hey cloud watcher - you only have 6 hours, if my students were levelling off within 50 feet after that little experience I would be very happy. As Tinstaafl and the others said it really is just practice practice. You sound like you are doing fine.
Remeber to start the level off at about 10% of your rate of climb: i.e.: if you are climbing at 700 fpm on the VSI start your level off 70 before the altitide. Then it is a matter if pinning the attitude outside and just cross checking inside. To be a good VFR pilot you don't want to be fixating on the instruments.
Before you know it this will all become second nature.
Hold the nose down as the pressure increases with increasing speed then trim holding the horizon one third of the way up the windscreen.
We all have good days and bad days and there doesn't seem to be any reason. It's early days! Remember to enjoy it!