Most people have an imbalance of their eye movement muscles. Luckily the brain keeps your eyes pointing the same direction - so no double vision. Such imbalance can be easily measured using tests which dissociate the images to either eye. Test results can be highly variable and affected by testing technique, use of glassses, subject alertness etc. etc.
You need to see an Orthoptist - a health professional with an interest in eye movements. Nearly all local hospital eye depatment have one - your GP can refer. Take with you a copy of the CAA exam results, your glasses prescription (from your Optician) plus JAR Class 1 vis regs.
The test results can be checked and if still outside limits exercises to improve your "muscle control" will hopefully resolve the issue.
Good luck
SL