I'd like you all to use your head on "as seen on the internet" subjects like this one. The video is saying that your transfer bar is in danger of breaking if the top of the hammer does not come to rest on the frame. That might be true, but it misses the main point. Broken transfer bars are not an every day occurrence. In fact, the most common part in a Vaquero to break is the hammer plunger, not the t.b.
Other authors will insist that there is a certain type of hammer strike required for reliable ignition, and to adjust the hammer and t.b. in a certain way. In order for the t.b. safety system to work, the t.b. must be pulled downward by the trigger as the trigger is released after a hammer strike. If the t.b. does not descend below the firing pin, and is pinched between the hammer and the firing pin, the t.b. safety system cannot work to prevent an A.D.
Most revolvers I have seen come off the line with too little pressure on the t.b. and not the other way around. In any case there are a variety of things on a new gun that require attention and adjustment - no surprise there. Another factor to consider is that installing a lighter hammer spring and a lighter trigger spring absolutely changes the dynamics of how hard the hammer strike is, and whether the t.b. will pull away from the firing pin when the trigger is released. As usual, you can't just change one thing in a mechanical system without affecting something else.
Carry_Up