straight arm traction

[novaswimmer]

Low slipfactor and little speed-variation seem to be results of just really good technique, good streamline, low drag, good (natural or induced) body fore-aft balance, good propulsion, etc. All the things that I've been struggling with all these years, LOL! So they are not really focal points per se. I don't think you necessarily strive for 'low slipfactor' (maybe some can intuitively), but it is the big payoff or the big end goal, when you get all those other pesky details under control.