bf poo comes out really easy, as the others say the sun gets it out. you don't even need to prewash/rinse ... and i personally only wash at 35 (although some others may wash hotter). i did this and line-drying for all of dd's bf nappies, and none of them ended up stained. if it's not sunny outside, you can lay them in your windowsill and it'll still work.
i don't use paper liners, but find the odd time that dd has nappy rash a little bit of paw paw salve and a fleece liner and it's cleared in no time. also i'm sure you are already, but make sure you change as soon as possible after a poo as it will get worse if it's in contact with the skin for longer. i find changing more frequently during times of a rash definitely helps.
regarding washing powders, i wouldnt' get any nappy-specific stuff. definitely use powder rather than liquid and it doesn't really matter which powder within reason. i've heard of people using ecover, simple (or is it simply?), bold 2-in-1, ariel. the only one i've heard bad things about is Daz.