Hi! 3 friends and myself have bought a Janome Artistic 18 Mid Arm.....I assume that is the machine you are speaking of. We are having tension issues too but on the top side of the sandwich....it seems like every time we sit down to work with the machine it has to be adjusted. Is this normal even when you leave the same thread and bobbin in place? We have tried fiddling with the top tension but not the bottom yet.