Over balsa, Japanese tissue is lighter, tighter fiber and needs less filler to be smooth than silkspan, Polyspan or Carbon veil.. Not, however, strong enough for open structures except for very small models.
In my experience, trying to fill balsa with just dope and fillers is hopeless. Each successive coat brings back the grain. Maybe if you leave a week of outgassing between coats that would not happen, but I haven’t that kind of patience.
I have been pleased with two or three coats of very thinned epoxy, sanded between coats to give “tooth” for the next coat. Mixing in some cornstarch really helps too! It is lighter, fills better and sands out more easily.
BTW, cornstarch is cheaper, lighter, less toxic than Talc, and absorbs some of th paint for a better bond. And you can swipe all you need from the kitchen and the little woman will never notice.