Use the single hole throat plate.
Use 'leaders' or 'spiders' or small pieces of material to start at the beginning of sewing ... holding the threads firmly to the back of your work.
I also do not sew together triangles but use the square method where I chain piece 1/4" away from the center diagonal line on both sides of the line ... using squares @ least 7/8" bigger that the finished HST. If I know I might make a mistake, then I start with squares 1" bigger and trim down using my Martingale bias square ruler.
These are the biggest helps for me.
ali