Greetings,
a low yo-yo will never help you overshooting your opponent, especially not when he is starting nearly from your six. What i liked to use, break flat shortly, then pull up, and with the same rolling momentum, roll back towards the opponent. Unfortunately, i have deleted all my films so cant show it to you. Anyway, if youre planning to overshoot, you have to be slower than the opponent - quasi pull up while rolling - but beware, this can be used against you.
Also, you mentioned, you are trying this in a 190. You must like a challenge : )
190s turn horribly between 160 and 250mph - from when the flaps retract to the first blackout. So your goal must be to arrive from under the opponent but with E and take a killer snapshot on him in the vertical, while opening the flaps in the same time to be able to continue in a vertical rolling scissors. Your plane is able to handle quite a few aircrafts in this way: ponyes, jugs, typhoons are easy, 38s, jaks can be done if the opponent is a bit lesser skilled than you, but with accuracy and a little bit of luck, even spits might fall into your trap.
In that case if this tactic fails, you still have an other option: dive away, til you reach like 350mph. If the opponent is following closely, try the high speed overshoot, chop the throttle, kick the rudder, roll quickly, burn enough E to make him overshoot and take the snapshot. If the opponent stays loose but still following you, try the break-reverse method - it usually works. In that case if the boogey is just staying high or climbing, just run away, he just doesnt worth your time.
Back to the sustained rolling scissors: in any aircraft, but espcially in the 190s, its all about to keep your flaps opened, pointing your nose up as long as possible, performing accurate hammerhead reversals (the 190 really excels in it). A low yo-yo is always a fail in this aircraft. Dont plant illusions, the 190 cant turn - all it can do is the high speed rolling scissors or the slow speed vertical overshoot.