David R above has pointed out my thoughts. Why can't you get and keep a good bloom and why fertilize 3 times per year? That's unusual except in some areas of pine tree country. You may be able to lime once and fertilize a lot less.
The next time you need to fertilize, collect a water sample and send it to A & M for analysis. I believe they recommend a new baby bottle for collection. It's fairly inexpensive. Post the results here or ask for their recommendations.
