sevenstrokeseven - V1...engine failure... and you're saying to trim the rudder on while still on the ground???
Random - everyone is saying the same thing - get the rudder right FIRST, then a steady rotation with the rudder locked/frozen/fixed. The rudder will almost always be slightly off, you can see that by your ailerons. Small, steady (never ABRUPT) rudder input will fix that. I think of 'squeezing' in more rudder vs. 'pushing more rudder'. Squeeze, squeeze, squeeze, until you have enough.
Keep in mind most people don't use enough rudder, especially at the time of the failure.
The WORST thing you can do is start cycling/changing rudder inputs. Yaw issues, advancing wing, especially from a swept wing, etc, will create control issues.
You need to make small, targeted corrections. It's a constant ballet to get it right. Scan, correct, freeze. Scan, correct, freeze. The smaller the error the smaller the correction.