I would refrain from using a heat lamp to get up to that temp since it can cause dehydration. Just make sure he is staying hydrated, his gums should be pink and moist and his skin should bounce back on his shoulders once pinched.
Watch his weight like crazy and at the first sign of anything wrong, check his temp and if normal...supplement. Just remember they may need burped if you bottle feed and also pottied. You can give him to mom to do that or you can use a warm, damp wash cloth.
Hope he continues to do well. As for the tail docking, I probably wouldn't do it. Being that small it is very doubtful he will make it to the ring anyway. I am sure he will be really cute with his longer tail.
Right now it is more important that he not miss a beat.