Way to hijack a thread - 10 wheels - love the pvc used a Dinottee mount - but the subject is speed.
Bottom line, to get faster, a cyclist has to know how to "turn it on" - "go for it" or whatever - but some of time must be spent with and enthusiastic dedicated mindless effort at riding a bike as fast as you can. Using a hill as an obstacle can work as well as setting specific time frames.