wdp_un_updates_data database entry is causing 502 error by overflowing Wordpress' autoload

I am having trouble with multiple WPMU DEV plugins that are adding a ton of info to the autoload from the database. The db entry wdp_un_updates_data has over 300kb of data (my server times out at 500kb) and I'm not really sure what is causing all the information overload. How do I reduce the amount of data and queries being caused by the plugins (most notably CoursePress Pro) in order to eliminate these 502 errors?

For reference, here is some of the data showing up under the database entry for wdp_un_updates_data:

a:14:{s:8:"projects";a:176:{i:1003656;a:22:{s:2:"id";i:1003656;s:4:"paid";s:4:"paid";s:4:"type";s:6:"plugin";s:4:"name";s:16:"Membership 2 Pro";s:8:"released";i:1433432625;s:7:"updated";i:1435915221;s:9:"downloads";s:4:"6769";s:10:"popularity";s:4:"2491";s:17:"short_description";s:92:"The most powerful, easy-to-use and flexible membership plugin for WordPress sites available.";s:7:"version";s:7:"1.0.0.8";s:10:"autoupdate";s:1:"1";s:9:"changelog";s:970:"<p>- Add new option to customize which users are considered Admin users (details in the Help > Advanced page)
- Fix a typo in the PayPal Single gateway that caused M2 to ignore some payment information
- Fix bugs that prevented removing protection from individual posts or pages
- Fix the search function on the Members page
- Fix two possible infinite loops that resulted in timeouts or rule values not being saved
- Fix wrong protection logic of the Admin Side Add-on
- Fix wrong protection logic of the Advanced Menu Add-on
- Fix small issue that did not correctly disable the Media Add-on
- Fix a wrong parameters that limited search results of list tables to 5 items in some cases
- Fix the description text of the ms-protected-content shortcode for admin users
- Fix a typo in the ms_rule_has_access filter
- Fix a possible/rare mis-configuration that could happen on single-site installations</p>
";s:10:"compatible";s:50:"WordPress 4.2.2, Multisite 4.2.2, BuddyPress 2.3.2";s:8:"requires";s:2:"wp";s:3:"url";s:47:"https://premium.wpmudev.org/project/membership/";s:9:"thumbnail";s:82:"https://premium.wpmudev.org/wp-content/uploads/2014/10/Product-Content-280x158.png";s:16:"instructions_url";s:53:"https://premium.wpmudev.org/project/membership/#usage";s:11:"support_url";s:56:"https://premium.wpmudev.org/forums/tags/membership-2-pro/";s:13:"wp_config_url";s:26:"admin.php?page=membership2";s:13:"ms_config_url";s:0:"";s:7:"package";i:0;s:11:"screenshots";a:4:{i:0;a:2:

That goes on for thousands of lines. Your help is much appreciated.

Thanks,
Paul