If your goal is 5-8 then you should be trying to get 8 on every set. Once you get 3x8, increase the weight and repeat. You should never intentionally stop short of your goal.
Please tell me you went for a 60 min bike ride outside and didn't spend 60 min on a stationary bike. I wouldn't do either on leg day but that's a personal preference.
If you don't know how to order the exercises then you shouldn't be doing your own programming and you definitely shouldn't run PPL. What novice program are you running that you are getting bored with?