Hi Doinw,
Typhoon and Apex have given the reasons why, but I will offer you some advice.
The balls you are buying are "premium" balls, and with your equipment, you will never get full value out of them, and are very expensive and really annoying if you lose one (highly probably looking at your stats).Personally I think this borders on lunacy - I used TourSD balls exclusively until I made TM and had enough attributes from those tees.
You would be much better advised to buy at least 2 good wedges, and possibly a cheap WGT ball to give you some spin.
This will aid your short game enormously and get you much closer to the pin when you miss the green, or allow you to shoot for the pin on your approaches with the wedges.
Your scrambling and sand save percentages will increase dramatically, also allowing for your putting stats to improve by getting the distance to the pin lowered.
If you do not have the money to spend, use the earn free credits to do surveys and videos - many players can earn a considerable amount of credits this way.