Grant have a read of this page from TV.
Not saying go out and buy Televue eyepieces just a good articals which will explane every thing about eyepieces and scope FR's ect..
http://www.televue.com/engine/page.asp?ID=140
http://www.televue.com/engine/page.asp?ID=222
http://www.televue.com/engine/page.asp?ID=131
http://www.televue.com/engine/page.asp?ID=141
http://www.televue.com/engine/page.asp?ID=139
You have the 30mm 80deg 2" giving 66x .
You could go to a 55mm 2" 50deg plossel 36x with the f10 SCT for lower power and still be ok as far as exit pupil , but the actual field of view or true field( the area covered in the sky as seen through the ep) of the eyepiece will be about the same but at a lower power so the 30mm 80deg So there is nor need to go lower in power.
Mark