Trouble with overlay cuff bracelet

Since I haven’t seen this show up in the forum in the lst couple of
days, I’m going to create another thread. Thanks Richard for the
rosebud tip suggestion. I tried it, but produced another 50 grams of
scrap. There was plenty of heat, but the two pieces never seamed to
want to have a good flat fit. I can file a butt joint to a perfect
fit, but I can’t figure out how to make a larger flat surface
perfectly flat, especially after applying solder to one side first.
Can anyone suggest a video or a book that describes the various
techniques for sweat soldering large pieces? Also, is it normal to
spend 30 minutes placing small pallions of solder on the work piece?