Playing Macro Observations Please

I'm inclined to argue your belief that you need assistance.

You're getting sharply-focused (well, considering the subject...) 1400-pixel images of a Cent.

Don't worry about aperture. Just lengthen the exposure. If you're on a firm mount and a timed release, there's no reason why you can't go down to 1/4 or slower to accommodate the lesser lighting. Admittedly, I'm using different equipment, but I've never used more than 150w on a coin.

Indeed, noting that the background remains in decent focus, you could probably open the aperture a stop or two without losing the depth of field. That will add effective wattage to your lighting, at the same exposure.