I think your set-up looks pretty good.
For a long time, I lifted weights on my off day, bench, deadlift, squat, barbell rows. It worked for a while but, in my opinion, I think it contributed to over-training and a few over-use issues. Doing 300 some push-ups a week plus bench presses and overhead presses was a toll on my elbows and shoulders. So I actually switched to doing weightlifting after simplefit and that seemed to work out better. Took the off day to rest, or do light cardio or yoga.
Just keep an eye out for symptoms of over-training, over-use, that's all.
If I feel like doing something on my off-days now, I do The Dumbell Bear
or kettlebell swings. Something that can give me a good workout in a short amount of time.