what i llooooooveee to throw when i spar is a 4 piece...
jab, straight, lead upper, rear overhand.
works really well.. i just spared today actually haha. against a pro boxer and i landed it well and made his eyes water. it was nice. give it a try.. hope it works for you.

p.s. yea i may be a girl but im not an idiot ive been boxing for 2 years and been aroudn fighting MMA and boxing for 5 years now.