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Postponing the signals is not the only problem of hyperventilation or low CO2. Much worse is the shift of Bohr saturation curve, which means the oxygen affinity to hermoglobin will be higher, hence it won't be released where it is needed as easily as normally. In other words, your hypoxic tolerance will be lower. Or if you want it even simpler, then you'll black out earlier. But there are are many other disatvantages. We were discussing them often in diverse threads about hyperventilation in the Science section.Also, by purging your CO2 from the lungs and bloodstream you'll postpone your warning signals. So much so that it will become surprisingly easy to land in a Black out. In fact it can strike you without warning out of the blue.