Not familiar with the Tiara but Handiquilter makes all the Babylock midarms and longarms. Tension setting will be a constant variable for you, even from bobbin to bobbin. You get used to it and also used to tweaking tension. So many things impact it from type of thread to how tight the bobbin is wound to batting and even fabric. It seems a bit daunting at first but you will soon get used to checking tension constantly and tweaking it often. You may want to invest in a Towa tension guage for your bobbin.