I did not see any point in which the pyro faced an even engagement. For example in the first engagement of the game, the pyro (220 metal) was facing against a lone scorcher (130 metal) which unsurprisngly the pyro won. There is no micro that can save you from such an uneven engagement.

Another problem was the big blindspots in your defense such as the pyros getting in to your base by jumping on to the raised area. There was no defence there and unfortunately pyros are the best at punishing negligence.

Good radar coverage and some porc (even one lotus can distract the pyros enough for your raiders to kill it) or some tricks like imps work nicely.