Hummingbird Compression Score very low but refs to Upfront issues

Hi. We've just put up our first trial site using WPMU, based on the Fixer and Upfront build. Installed Hummingbird and ran various compression, etc etc. CDN and cache in place. Hummingbird shows a very low score of 40, ref to compression issues.

When we check we see the following:

Compressing .../admin-ajax.php?action=upfront_load_styles&layout%5Bitem%5D=archive-home&layout%5Btype%5D=archive&layout_post_id&template_post_id&ver=1.3 could save 918.3KiB (92% reduction).
Compressing .../upfront-dependencies/scripts/6de35c09f4dd702561742edd90ee42e1?ver=1.3 could save 148.6KiB (74% reduction).
Compressing ..../admin-ajax.php?action=upfront_load_grid&ver=1.3 could save 73.9KiB (82% reduction).
Compressing ..../upfront-dependencies/styles/fdc179f4771c344422405b885b52ed5a?ver=1.3 could save 71.3KiB (81% reduction).

How can we sort these as they seem to refer to Upfront?

Thanks.