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This is a common mistake of principle.

The ball is curving BECAUSE your club is comming accross the ball from out to in. Your clubface is aimed just fine. Understand that where the balls starts is more a product of the face angle. The direction the clubhead is traveling determines the spin.

So you MUST be making an outside to in swing relative to the clubface in order to put the cut spin on the ball. The face is aimed at the target, but your path is not.

Is this problem happening on all clubs?

What would happen to ball-flight with a proper club swingpath, with the face open at impact?

The ball would start right and continue fading right.... if the path is toward the target but clubface open of target.

If the path is in line with the clubface, then it would be a straight push where the clubface is aimed.

The ratio is about 80% clubface, 20% swing path... but higher than 80 when the swingspeed decreases.

Wow. That does go against common 'knowledge'. At a fixed clubhead speed, with a fixed club, does that ratio depend on the degree (pun intended) of misaligment between path and clubface? For example, is the ratio siginificantly less for a small misaligment, and larger for a severe misalignment? Or does the ratio stay pretty much constant throughout the range of possible misalignment angles?

Well common "knowledge" is not right. It's close, but not quite. Honestly though we're dealing with such a fast occurance that it really takes high speed technology to track exactly what happens. Now that the technology has made the truth available, the old teachings are struggling to adapt. Many of them have built their ideas on false assertions and that makes it hard to get the wrong information removed from common instruction. Not that I blame them mind you... i used to believe in the old ball flight laws too. It took a lot to convince me otherwise.

The slower the speed, the less spin it will have... so therefore the faster the clubhead speed the more swing path plays a part in where the ball ends up. This is a lot of why it's easier to hook or fade a 3 iron than it is a pitching wedge.

With more severe misalignments, it should still equal out. There isn't enough friction past a certain point to create enough spin to really change anything.. and there woouldnt be enough ball speed to make the ball go far enough for what spin there is to take effect.

just my woods, irons are fine

I would have thought that some careful experimental effort aided by an 'Iron Byron' could have solved much of that puzzle (ballflight as a function of swing path and clubhead aim)!?

No, because the observations would be the same. You have to actally see the ball take off from the club in slow motion to get the accurate answer.

I'm willing to bet the shafts in your woods are stiffer than the ones in your irons.

maybe, but i got regular shaft in driver and steel shaft in 3wood and i slice the driver more, regular in 5wood and slice that the less.

club loft probably has more to do with the reason why you slice the 3 and 5 wood less than driver.