I would have thought your SS HR should be about 155bpm. With a max HR of around 185bpm i think 170bpm is certainly too high and you are doing threshold work and not SS.
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But then is the question of how developed is an aerobic engine. For example during longer SS (15+) and threshold intervals my HR in lines with zones but then during later intervals rises, simply because I am untrained. Then in my personal opinion there is a problem with measurment of people that start training and people that are trained and more delveloped. My rationale is that as long as it is not harming any recovery then I do not care about HR crossing zones. But observing HR is my measurment of progress and fitness.
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