I used the Mongan Method with ds and he was a long birth. I loved it and got to 9cms with this quite easily (after that the birth went pear shaped but not due to hb). I also miscarried a sick wee boy at 17-18 weeks gestation on my own using HB. Was the happiest part of a sad situation. I did the 20 counts easily and lots of visualisation. I am due in less than 2 weeks and am superdooper excited about birthing again. I feel really confident going into this birth too. I find I can not do the 20 count in practice but easily achieve it during active labour. I like the visualisations in the last stage of labour when your body is nudging baby down. I also love that I can use the 1-8 count breathing whilst cuddling my son and it calms him very quickly.
I can't stand listening to the cd though as the voice distracts me and puts me off! Good luck- it sounds like you have taken a technique and adapted it to suit you better.