Timid LO Zapdos causes HUGE problems for you, as it outspeeds your whole team and pretty much demolishes everything. In fact, the only thing that isn't OHKO'd by the combination of T-bolt/Heatwave/HP Grass is Heatran, which still takes very heavy damage from Thunderbolt. Offensive Calm Mind Raikou does the same thing pretty much, except it flat out OHKOs everything after a boost. LO Stamie also outspeeds everything and does heavy damage.
You need something besides Scizor to revenge kill faster threats, otherwise you're not going to win many matches. At least Scarf Hetran so you can revenge kill weakened threats. There's no real problem here with covering your weaknesses with synergy, but when positive base 100 speed pokes outspeed your whole team, you're automatically going to be at a disadvantage.