that tubing taste goes away before it gets bottled. I did the same thing you did when I first stated tubing and it wasn't till later, someone told me not to worry about it. I wasted lot of sap. I try to do things as pure as I can so it was hard to boil the sap that tasted like tubes. you can do a search on this site and see that most deal with the same situation when adding new tube. this week looks good for us here.