This was a pretty good warstory and your team did well to win. Also, paralyzing sazandora with stun spore was the best move you made and it won you the match ( a lot of people said this already but still).
One thing, though, is that you should have foddered your Latios at the end to guarantee victory. The draco meteor from Sazandora on your Heatran did over 50%, which meant that a crit could have killed. If you chose to use Draco meteor on his Sazandora afterwards (over ice beam, which would probably kill), draco meteor could have missed and he could have critted you again and killed Latios and won.
I know that it is unlikely (and I think you would win guaranteed if you were to use ice beam), but it is possible. You say that you are "playing it safe" by switching into Heatran to resist the Draco Meteor, but you already knew heatran could kill with dragon pulse, so why take the risk of it dying? If you want to win a match GUARANTEED, you have to take into account the possibility of the worst hax.