I started today working on another fake-lug practice piece. I used a bit too much silver, but it filled nicely and turned out well. Pretty close to perfect. I just need to keep the heat down a bit to avoid crispy flux.
This didn't turn out quite as well. I got the shorelines filled, and most of the higher stress areas, but I wasn't able to fill the crease between the two tubes all of the way to the very center in a lot of places. The gap is pretty small, but I'll have to work on it a bit.
I also had trouble getting the filler to flow under the "ears" at the back. The ears basically just clamp down on a seatpost, so it wouldn't be likely to cause a catastrophic failure... still, I'll have to start by getting them nice and hot next time.
My new lugset is thinner, but covers more area. The shorelines are also a lot smoother, no huge points coming from small joints. I think that'll help a lot when it comes to getting an even flow without overheating things.
Here's what's left after the autopsy!