I am counting PS+ subs as PS+ subs, because they are game subscriptions. This month Gold gets merged in GP, won't exist anymore as a separate game sub.
And no, nothing leads to think GP is over 30M. They got stuck at 25M for a while before they stopped to report the amount of game subs. Which was some time before they started to remove $1 deals and announce price increases.
And yes, MS is doing worse: if it isn't enough to see around twice the game subs in the PS+ side, you can look at the revenue both MS and Sony make from game subs: it's way higher in the case of Sony. Sony started with game subs way before than MS and always had better numbers.
Sony not only sells more consoles and more first party games than Microsoft: they also sell more game subs.