High ISO advise

[Lumens]

WOW! Thanks for all the advice. I'm going to have to make a list of the things to try and perhaps get braver with the things I've already tried. I know a better lens ("L") or Full Frame might resolve my issues, but learning how to use the excellent equipment I already have will make me a better photographer. The better equipment can come once I learn how to REALLY use what I already have.

Thanks again!

[HDNitehawk]

I know a better lens ("L") or Full Frame might resolve my issues

Not a completely accurate statement.
A faster lens or a camera that handles noise a bit better will help you go longer in the field before you lose light. With the best gear you might gain 4 (+/- 1) stops of light. For your 300mm length those stops will come with a price tag of about $3000 per stop.
As evening falls no equipment short of bringing your own lighting will resolve the issue.

[clemmb]

WOW! Thanks for all the advice. I'm going to have to make a list of the things to try and perhaps get braver with the things I've already tried. I know a better lens ("L") or Full Frame might resolve my issues, but learning how to use the excellent equipment I already have will make me a better photographer. The better equipment can come once I learn how to REALLY use what I already have.

Thanks again!

as with many of us money is an issue
start out with a canon 70-200 f4
the speed and sharpness of this lens will improve your shot quite a bit. You will not miss that 300