I have experimented with ultra short heads for both SH & DH rods for 7-8 years.
Early on it was RIO
sinking Versileaders Spey leaders on 0wt & 1wt trout rods,
In addition, cut up old lins into 16ft-12ft shooting heads for softer 4wt Sey rods.
Used the 4wt & 5wt Ambush heads since they were introduced on soft 4wt Spey rods.
Whwn the RIO
Skagit Trout & OPST lines were introduced, I purchased full sets of both.
On my local river pool did an afternoon experimenting with 3wt Spey and SH 2, 3 wt rods.
The little SH rods would cast a bright yellow size 2 Zoo Cougar 50-60 ft with ease.
Walking back to my SUV an older guy came stomping up to me with a mean expression,,,, quickly changed to a smile when he saw the bundle of fly rods.
He stated that he thouht I was spincasting in a fly only area and was going to chew me out, Could not believe how the 7ft SH rods would cast a large fly that easily.
There is no right way or wrong way to cast a fly line, if you are happy,,, continue.
You postinging and videos tell me that you like to experiment and are a student of casting,,, please take my blunt comments as constructive. I mainly fish with 10'6" - 11'+ rods and my individual style reflects my comments.