Hi Doug,
I agree with Leon and AlexN. Eta is very rich in Ha so modded or unmodded great pics are possible. The tarantula the same, though you will get a truer redder colour modded. Give the christmas tree neb or horsehead a go and I am sure you will be pleased with the result.
Thats the whole point, if the entire sky was filled with objects like Eta, noone would mod, but its not. So by modding you have increased the viable range of targets you can attempt
Also, and I may be wrong. You are shooting widefield so on an object like Eta the extra Ha you are picking up is lost in the widefield. You may see far more detail with a longer FL.
Paul