Well yeah, we need a whole lot more information on how things go wrong. But just a shot in the dusk, if you're mentioning how powerful they are, you might be overthrowing them, as in trying too hard.
This could mean anything from you're whipping a straight up haymaker, to you lean your weight into it too much and find yourself off balance, or you just hold on to it too much and fuck up the timing. any of these things would mean that you find your timing and balance compromised and are easily countered.
A note on hooks in general: the big left hook is a vaunted thing in boxing, but it helps if you don't think of a hook as a punch you should juice up. Throw it for speed- whip it in instead of muscle it. It will hit just as hard for one thing, and for another it will slip in and catch him by surprise which is the point anyway.
And with the right hook- I hate the people who say "there's no such thing as a right hook in good boxing." That's stupid. but the point they're trying to make it, it's a very situational punch, not a go-to. You have to be at the right distance- if you can jab or kick you're not at the right distance- and it needs to be used for one of three reasons-
1. If there is a legitimate opening, as in his hand is down for some reason, or he's pinched his elbows in to stop uppercuts and thus made a hole,
2. As a cross-counter to a jab when you've slipped inside, or finally
3. As a "lever" to disrupt his rhythm, pin a hand in place, or force an opening for something else while infighting
Don't know if this all applies to you, these are just hard learned lessons from someone who used to overthrow the shit out of his hooks