That's not the only way at all. Imagine this for instance, you take a transfer port on a gun like the impulse, and you reduce it's diameter to about 1/2 of a millimeter. Suddenly gas is extremely constricted and at 180psi you simply cannot put out enough force to propel a ball at a decent speed since the flow is so constricted. We'll assume perhaps that it takes 2 miiliseconds for "x" volume of air at 180 psi to get to the ball with this transfer port. Now let's assume we were to increase that transfer port to 9 millimeters. Suddenly flow would be alot better. The same "x" volume of air, at 180 psi would now hit the ball in a period of about 1 millisecond. You're getting much more force for the same volume and pressure when you use a more efficient marker. That is how valves like the tornado valve are much more efficient than valves like a shocker valve. All the bolt does is allow air to flow more freely so that less is wasted. An interesting thing to note, is that when you turn up your trinity it increases your velocity even though that shouldn't happen with a fixxed volume paintgun. The reason your velocity goes up is because your transfer port opens more rapidly when the bolt moves faster. You end up having less time with the transfer being half open and wasting air, so you get more velocity using the same pressure and volume.
And I figured all that out on my own too