Am I remembering correctly that the Shojin-Ryu is your own offshoot of mainline NGA? If so, what was the impetus to split away from the mainline and what are the differences in your curriculum from the original?
You are quite correct in that, Tony.
My original aim was just to find a way to teach the art that was more "natural" to me. I spent about two years just working on that idea, before I realized there was a bigger piece I felt a need to work on.
So, the starting point was twofold. I'll have to give a bit of background on NGA to explain part of it. NGA's core curriculum is divided into 5 Classical Sets, each containing 10 Classical Techniques. The Classical Technique is a one-technique kata, slightly stylized, though not nearly so much as you'd see in one of Kondo Sensei's Daito-ryu videos. In mainline NGA, students are taught the Classical Technique first. Once they can repeat it with some reasonable facility (usually an entire class), they learn an "application" (an actual defensive use). In most schools, testing for the first four student ranks is almost entirely around the Classical Techniques, and the curriculum is focused around them to the extent that students are often taught to keep their applications as close as possible to the Classical.
I found that the Classical Techniques bred a step-pause-step-pause-step approach in many students, because they are fairly exacting (as most kata are). I also found students were focusing on the precise movements, rather than the principles, so some of them took many years before they started being able to adapt to brand new situations. So, my initial aim was to reduce the focus on the Classical. I still use the Classical Sets as the defined area of the curriculum, but my students don't practice the Classical form as often as mainline students do.
I also made changes to the Classical forms, in part to remove some of the requirement of precision and replace it with a requirement for adaptation (meaning the new Classical form requires they make adjustments the old one didn't).
I also altered the focus of movement. In the mainline Classical forms, the vast majority use an exiting motion in the first 3 sets. Students nearly universally struggle to make the transition to entering, so I changed some of the Classical forms to focus on an entering motion, and put students in closer proximity for some of the techniques. I also changed some of the Classical forms to allow me to accentuate some key principles that I saw many students missing, even at later student ranks.
Then I added two more sets, called the Self-Defense sets, which are much looser. They are simply responses to some possible attacks. The intention is to get students some early responses that don't rely on "aiki", or even on good technique. The Basic SD set is very basic, and is what students work on their first few weeks. The content is some of the same stuff I'd use in a long SD seminar. The Advanced SD set is still a work in process, and is intended for students who've had a year or so of training, and has more ground work, some weapons defense, etc . Again, this is intended to be non-aiki material to supplement our core.
Those are the biggest changes. They aren't huge, and one of my students wouldn't fall too far behind if they transferred to a mainline school. I also changed some of the testing requirements (including some very esoteric Japanese vocabulary) and realigned the ranks (in part, to remove confusion if a student goes to visit a mainline dojo).
In part, Shojin-ryu is an experiment. I believe I can help students learn the "aiki" in Aikido earlier, without sacrificing the effectiveness. I hope it brings something new to the art, and fosters some thought and debate.
There is one other piece to the difference. I also have a minor focus on helping the students grow as people. We discuss leadership, decision-making, and how to translate some of our MA lessons to life. To me, that is integral to Shojin-ryu - it should help improve the student's effectiveness in life, since we hope they'll never actually need the physical defensive skills they are developing.