At the transition to the indoor season, increasing jump speed is crucial. With this brings timing issues, so technical errors need to be ironed out. Time often sorts a number of issues out, everything else being equal... it's a bit like getting your eye in in cricket or tennis, timing comes and that's what's being strived for when you get on top of practise. Spending too much time doing too short apprqach work will limit transference into actual event performance. Your CNS will get used to operating at a lower intensity and will need time to be re-set. If you don't hang about too much on short approaches then transference will be improved. There are a number of plyometric and running drills that can aid in this transition - but really there is no substitute for jumping at speed.
