I think that I have found(for me) pretty simple and effective type of progression.
For arms training I use one unilateral exercise for biceps and triceps.
I switch between right/left arm without rest(almost) in 3 sets
So I start with fairy low weight and my sets looks like this 15(not to failure), 12(close to failure), 8(close to failure)
I add 2.5kg every workout until I can hardly do 15 reps in first set.
When it happens I lower the weight on 10kg and start climbing again.
So far it works fine, I can see by my records that that I return to previous weight I able to do more reps then before
