Matt, this is exactly what happened to my wetsuit same as yours. After less than 5 months I had 3 rips under my armpits forst left then right.MarcinB is right. I totally forgot I'm guilty by advising him wrong size.
Yes indeed I like tight wetsuits for performance cause after 1-2x they are not tight for me anymore...
It's also true they wear off much faster because of it...best example is that after 5 months I already have tears under armpits, while my friend has 1 wetsuit for 2 years and not a single scratch...but his wetsuit is not as tight fitted as mine..
I am 188 and 74Kg, L was too loose around my belly and legs, M is very tight, but once in the water is quite OK.
I wish they would make a long version of the M...
BTW, congrats for your super results