I have recently discovered a great new shooting technique to deal with slow shutter speeds. Now I'm a wheelchair user I just slump down in the chair a bit, so that I can rest my elbows on the arm rests . I can get down to about 1/5s with a normalish focal length this way. Who would have thought a wheelchair could have advantages. Big disadvantage is trying to get the driver (usually my daughter) to position me as accurately as I would like while on rough (for the chair) ground, where I cannot adjust my own position. Trying to tell a non photographer that being positioned exactly to the inch is really important seems to fall on deaf ears.
Otherwise I have always prefered the arms in tight against the chest with left hand under the lens, as my shooting position. I use the very similar position when shooting standing rifle competitions.
I admire your dedication. I love shooting, but I don't know that I could honestly say I would still be shooting in your position.