Pressing and soaking and such can quite possibly make low grade leather (Elk Masters, Le Pro & Triangle) perform better; however laminated tips are a whole nother story.
Any thing that you do beyond what was done in manufacturing puts the tip at high risk for layer seperation. At Tiger the leather we use in all out tips is of the highest quality and hides are specifically chosen for there desireable properties with regard to pool playing.
On top of all that, layerd tips are expensive and experimenting costs $$$. LOL!
When laminated Tiger Brand tips are under a minimum of 30 tons of pressure, we can go to 50

, at glue up. I do not think that any bench vice or jig setup can come close to that.