I'm not much help on the writing thing, but I am dealing with a similar issue while recording our new CD. At some point you have to let go.
I HATE HATE HATE recording. First of all you go and stand in a hot room and sing the same damned thing over and over again. Then you go back to edit it and listen to all of your mistakes over and over again. My bandmates love seeing the process of finagling things one way or the other - I just want to have a good cry and record everything all over again. Luckily I have learned this about myself, and know when it is time to leave the room and let the others handle my lead track because I can't manage to distance myself from it. And even if I CAN stand to be in the room, at a certain point you just have to say "enough! It's not going to sound any better."
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I HATE HATE HATE recording. First of all you go and stand in a hot room and sing the same damned thing over and over again. Then you go back to edit it and listen to all of your mistakes over and over again. My bandmates love seeing the process of finagling things one way or the other - I just want to have a good cry and record everything all over again. Luckily I have learned this about myself, and know when it is time to leave the room and let the others handle my lead track because I can't manage to distance myself from it. And even if I CAN stand to be in the room, at a certain point you just have to say "enough! It's not going to sound any better."