TO FLISS,hope i am not stating the obvious, when you do want to start experimenting with ornamentation rolls etc, i found it useful to slow the tune down for jigs maybe 108,      or slower AND THEN PRACTICE THE SCALE OF G MAJOR IN ROLLS SO G A G FSHARP G,    thenABAGA and so on[theseare fiddle rolls which adapt ideally to the english, or four note twiddles abaa or gagg, or g low dgg[ gives a pipey effect]then gradually speed them up using a metronome.