Solid Hardwood, Engineered and Laminate Flooring - Concrete Board screws sticking up 1/16-1/8"

I'm installing ceramic tile over a floor I've cleaned down to the luan. (hardwood covered by luan, not my choice, just my problem) After I've notch troweled my adhesive/mortar and laid down my cement board to create a good foundation, I've screwed in cement board screws to the best of my ability. What I am left with though is the tops of the screws approx. 1/16" - 1/8 above the cement board surface. My question is....when I apply my adhesive for the ceramic tile, will the adhesive cover the screw heads enough so as to not cause any cracking of tiles? shoould I remove, pre-drill, and re-screw them so the heads are flush or recessed?? Just a simple short answer would be appreciated...thanks.
Photoburg

Personally, I think if you know enough to ask the question, I'll wager this weeks wages that you know the right answer for you...*G*

Something you might try if you didn't the first time...

Rub the screw threads on a piece of soap before screwing them in; that helps lubricate the threads...try a couple and see how it works...

I usually use a combination drill countersink when working on wood but that's for finish work...

The little bit of backer board work I've done......I just used a coated galvanized nail in my nail gun and shot the boards...much more satisfying *G* I think using screws is a more secure method, albeit with more effort...

Let us know what you find out...

Maybe the experts will differ with me but I think the screw heads should be flush.

Pat

The screw heads should be flush, and if you can't back them out, take an angle grinder and grind the heads off flush.