But to achieve control, or rather, to realize that control has been achieved, you need to put yourself in a situation in which you usually lose control, and this time hold it
There is another approach
As you can just try to consciously avoid the situations which trigger your loss of control. Indeed, it is not always possible, but the successful implementation of the approach you mention (i.e. deliberately putting yourself in a situation where you typically lose control and kinda get used to it) is not always possible either. There are things which will always upset you, and losing money, as it seems to me, is one such situation
In my opinion, control is an opportunity to stop gambling painlessly following your strategy during an irresistible desire to continue
If you feel an irresistible urge to continue, forcing yourself to stop gambling won't come as painless as you think it should. If you succeed at it (which is not given at all as if it is in fact irresistible, it is, well, irresistible), you will likely start to experience something like the withdrawal syndrome