I've discussed it with the relevant devs and we're going to add 100hp to the max and comp (and trim) capes to make up the difference.
This thread was added on June 25, 2019, with posts from JagexJack.
Original Post
https://www.reddit.com/r/runescape/comments/c51j6v/buff_maxcomp_stats_to_match_prerework_stats_when/