Thanks for the suggestion of cooling them first. I'll drop the temp tonight. Will cycling the other beers in the freezer diown to 40 for a few days then back to high 60s (may not go as high this time) be a problem?
As for the process, I boiled sugar cystals and water as instructed, poured into bottling bucket (after it had cooled a bit) then racked beer on top so that it mixed as the beer flowed in.
Good point about the volumes, there may have been some loss at at the transfer from primary to secondary and from secondary to bottling bucket so the proportion of priming solution may end up being higher than if I'd managed to transfer all 5 gallons into bottling bucket. I hadn't thought about that before.
As for the video, if I had the equipment the geek in me would do it!
On a positive note, the bottle bombs may help put my case for a kegging setup!!! It also means I have an excuse to sample one "in the interests of science" tonight! I wonder how conditioned it will be after 10 days.