My simple and none commital (sp?) answer would be, it depends on your age.
The extra pace is worth the extra wides if you are still young.
The key to good fast bowling is adding accuracy to pace rather than the other way around. ie Bowl quick and then try to get more accurate rather tha trying to get the accuracy and then adding pace.
The reason is that if you try and get the accuracy first then you end up developing an action that is hard to bowl your fastest with.
I would always be wary of changing a leap as its important an action feels natural and any tweaking with the leap can make the action feel awkward and is a major adjustment.
Accuracy is often down to the left arm. Without seeing you bowl its hard to say for sure, but try running in hard and the normal action but bring the left arm down (front arm) when bowling down the line off of stump (ie almost choppong off stump in half)
The right arm follows what the left arm does and if the body, runup and left arm are going down the line of off stump then that is where the ball should go.
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