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What about an additional 2x6. Running from center of long 2x6 and onother running from center of head to center of foot. Or replacing 1x4s with 5/8 or better plywood?
In my own construction experience, I have found that when properly countersunk (with pre-drilled holes) a phillips head screw will go in completely and easily by keeping the driver absolutely level and dragging the screw threads across a bar of soap that I keep in my toolbox for that purpose. Keep the soap in a ziplock bag so it doesn't dry out or get dirty......
My wife and I are, simply put, LARGE. I weigh 300 lbs + and she weighs 260 lbs +. Do you recommend any additional supports for us?