Hi India Four Two
Read the issue with interest and it also reminded me of differences between descent profiles I would say are common practice in the UK and those I briefly observed in Canada.
I visited Black Diamond a few times prior to the proper start of Spring flying 2 and 3 seasons ago but amongst other things did manage to fly your K21 and a Scout. I will wait to get shot down in flames but would say that most clubs here adopt a higher speed descent once 'out of the danger zone' described by the Lasham research. Whilst your (lack of) failure history appears great I am curious as to how long your average 2000' tow takes from wheels off to back on. I realise that your density altitude is a big factor but with fuel prices in general over here, there is a lot of pressure to keep the operation as efficient as possible and interested in how time wise the low speed and flap descent works out.
Diverging off topic a little but look forward to hearing form you.