If you look at my message list you will see a similar story to yours. I've also had some whoppers. I feel now that the two weekly interval has run its course and four weeks would possibly be of greater benefit. I will then stay at 4 weeks, then 8 weeks etc, until I get to biannual flushes.
I also have an ultrasound scheduled for the 25th November so I may get a little inside information.