Can convert 3-6-9-10, but take out the six pin and is nearly impossible for me. Any advice, conversion technique would be grateful. Can throw straight or slight hook. Reverse hook is slightly inconsistent due to lack of use.

You have to throw a little more than a slight hook, not a lot of hook.
Actually, once you start thinking of it as harder or different from the 3/6/9/10, you've already missed it. Think of it as having to hit slightly more of the 3 pin than when you make the 3/10. Because of that you should not stand quite as far left (assuming you're right handed) as when you throw at the 3/10. You have to hit the 3 pin on the right and have the ball deflect slightly into the 9/10.

Normally when you throw at the 3/10, you want to hit as little of the 3 pin as possible, and you can throw a small hook or a straight ball. You can't throw a straight ball at the 3/9/10 or the 3/6/9/10 unless you want to depend on luck or sheer ball speed.