if they matched teams evenly then the queue would be pretty awkward and jittery because of how few people GS, even during the GST times with 60 people
they should just split HP as evenly as possible
if it's 3 vs. 2, the team of 3 should start with 2 HP and the team of 2 should have the standard 3 HP
obviously there are scenarios where the math isn't perfect, like in a 4 vs. 3 match where you'd have the team of 3 with 3 HP (9 HP total) and the team of 4 with 2 or 2.5 HP (8 or 10 HP total), but it's better than just outright mismatches
a lot of you would probably consider this to be "abusable" though, because (for example) I'd probably GS exclusively 2 vs. 2/3/4/5 with Brett (the classic Graalians dot com "it's not fair that some people are good" argument)
a numbers advantage is still way more important than having even HP, but whatever, just a suggestion