Conisag, at your age and starting training 2 years ago I'd expect you to have big gains, your body is brimming with natural GH and your own testosterone so growth is inevitible.
The human body responds to failure, when you push your body to failure it counters this by getting bigger and stronger. Your regime is pushing to failure but will only take you so far before you are not able to increase intensity, you can only manage a certain number of reps per second and it is widely accepted that growth is stimulated on the negative part of the movement, something you will not be experiencing because the weights you'll be using are so light.
You will get a result so far then you'll hit the wall with regards to gains, this workout could force your body into a catabolic state too as its more like circuit training for the arms, without the circuit if ya know what I mean.
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