I've made some changes to cpFeeder with the intent of fixing an issue that several users have experienced. Namely, varying product counts from one feed to the next (when nothing has changed in the shop) and sometimes zero products. I've run tests with large shops (80,000 products) with success, but can't be sure that I've resolved the issue. i.e. you might still have problems. I will continue testing and monitoring runs by all cafeToolbox users.
cafeToolbox
http://www.cafetoolbox.com/article.php/20080902204103521