Truthfully, the numbers start overwhelming me. I took basic photography in high school (back in the days of film...the smell of developer is burned into my nostrils) and remember a bit, but not much about it. Trying to learn all this and keep it straight makes my head spin. While I do know a higher ISO should help, I am paralyzed about turning my camera to any manual settings. I just let it do what it wants...and am often disappointed but it sounds like it's my own darn fault.
I'll give the 55-250 another shot (teehee) but I will continue to watch ebay for a 70-200 f/2.8. (maybe if I get a USM rather than the IS, I could afford one.)