I like this lens quite a bit on my EPM1. When I get a good shot, the images are crisp and sharp with excellent depth of field. Problem is, my keeper ratio is pretty low. I seem to be out of focus quite a bit with both AF and MF. If I crank up the ISO, i get a ton of noise. It seems I've been working at a shutter speed of around 200. What can I do to make this better? Tripod? Is my UV filter throwing things off? Poor technique? IBIS or lens stabilization? Need an EVF?