i agree, your music is something you should be proud of. unfortuneately, your are going to have to play some covers. people like stuff that's familiar. however, gradually put more and more of your music in until it becomes your entire set. i don't reccomend just switching to all original material at once.
as for you band wanting to go "cover", just remind them that cover bands only get so far. they never make it or really get beyond the club scene. if that's what they want you can't force them, but (cynically) you can replace them.
my advice is to keep pushing your stuff, but compromise with your bandmates.
the last thing this world needs is another cover band. good luck.
To improve technique and of course trying to keep all as clean as possible. I know my own limits and speed limits and so on I never play anything I'm not capable of. That wouldn't make any sense. After three years of playing I tried to play everything as fast as possible and that sounded, I would say, like shit, and I didn't realize that if I'd play bit slower things than I was capable of playing then everything would sound much better.
--Aleksi Laiho - Advice to Play By