I wouldnt worry, I have a CAAD 4 with no problems yet. It is vaguely possible that you can feel give in the tubes, but understanding the dynamic properties of tubular structures is a different matter all together. As an example if you do the same pressure test on a steel shafted golf club you get the same feeling of compression (almost is if you could dent it with your thumb), however a golf club shaft is less than 1/2" diameter at its narrowest and up to 43" long and is regularly smashed into the ground at swing speeds of up to 110 mph without breaking. It is truly amazing when you try and comprehend it. but as a crap golfer myself trust me it does work.