Not sure what you're asking, but it would work something like this: your 1RM is 100 lbs. Waterbury prescribes 70% for 10x3, then add 2.5% or 2.5 lbs for the next week. Take 2.5% of your 1RM and add it to the weight on the bar.
Yes, but probably not until you finish the written program and are ready to start over from Week 1. Go through the program all the way, then re-test your maxes before you start the program over or switch to a new one.
Hmm...two solutions I suppose--you could either progress the dumbbell lifts at half the rate (i.e. every other week add 5 kg) or add the 5 kg weekly until you miss a rep, then stay with the weight as long as it takes you to complete all the reps 2 weeks running.