I’m finding that something was said earlier on (maybe in the OP) is definitely the case… practice really does help.
I got the first one, but it was a mess. Last night, I thought I wouldn’t be trying this again, but I did earlier tonight, with the AA, which also was a mess.
Then, I just did another one, this time with no adhesive, neither Fujik nor AA, just followed the info in the OP.
I did still bend the 3 pins, but then held the chip with tweezers on top of the original 7135, and I actually used my regular pointy soldering iron tip, and I was able to get the tabs bridged (the chunky chisel tip I tried earlier made it to hard to get to the tab on the original chip).
I noticed that the top chip was slightly off to one side, so again, using the tweezers to hold the top chip, I heated the tabs, and slid the top chip over a bit, then let the solder cool, and then I checked the 3 pins and they were lined up pretty well (and touching the pins on the bottom chip. It was then easy to solder the 2 outer pins, and voila!!
I will say that this last chip, the 7135 was pretty much out in the open on the PCB, which made things a little easier, both for the tab and the pins.
I have 3 7135s on top of the original 8 now, but am measuring 3.65 amps (chips are 380 mA 7135s), so I think that the battery is now my limiting factor. I ordered a couple of PDs last night from FT, so it’ll be interesting to see the tailcap current looks when I try them. I’m hoping for ~4.1 - ~4.2 amps :)!!