Nammie I would like to know more about that tack stitch.
I used to take small stiches and cut the thread, but now I am quilting other people's work, I tie off and bury.
I mainly do edge to edge quiilting and hopefully only need to do this when the bobbin runs out.
But I do get the occasional whoopsey and need to restart.
I tie off at the time by unpicking top and bottom threads for about two or more inches then starting again at that spot tying all four threads together with a square knot and bury them.
I find that works for me by using an embroidery needle with an eye big enough to take all four threads.