... I'm paraplegic and use a wheelchair and also workout at home w/ chin up bar. I've only done
3 cycles (8 weeks each) of HST in the last year and a half. The other time I applied strength training which helped increase volume for my pull-ups and chin-ups.
...heres my 2 cents at what you could try.
Just do a normal pull-up, keep the total reps the same for 3 workouts. Then, try to add one more rep w/o hitting failure for the next 3 workouts.
I would think that this method along with other exercises will increase strength for the chin-up. Then you could apply load progression. ** But if the pull-ups are the only exercise, it would still work but perhaps at a slower rate? --> im not sure
So I think im trying to say, focus on increasing the strength, in regards to the pull-up exercise first, and ensure correct form. Then apply load progression in that same HST cycle or the next HST cycle.
Try all of these suggestions to see what works best for the situation.
Michael B.