deerslayer6837,

What the guys said above is a great path to take in solving your problem. I would like to add a few things for you to know and try. So when you make adjustments on the 4-1 you MUST unplug your battery each time. In other words, fly it, land it, unplug it, make that 1/8 turn or less, reconnect and test fly-over and over and over until you stop the spinning problem. Another important tip is, the heli will act differently as the battery starts to go down, so do be aware.
The second tip is to check your shafts. Wind up the heli, not enough to lift off and then shut it down and watch the blades spin. Under optimum conditions they will spin and slowly wind down and stop one before the other. If one stops faster than the other by "far" then you might have a shaft binding which then restricts it thus not letting keep up with the other blade to make you fly straight. I have lived this and like you had my trim slid all of the way over and she still wanted to spin and this is how solved my issue. I would just urge you to take this small little test and observation before you get into the 4-1. Unless you have crashed hard the trim pots generally don't need to be adjusted.

Good Luck JPee