Hmmm... why is that? The 2uzfe is right in line with this forum. Too bad if true.
Anyway, I would be VERY carefull running more boost as the connecting rods are not known to be reliable. Also without outstanding tuning the newer engines have minimal space between the piston tops and the first ringland. This is common on most newer engines as it reduces the trap area for unburned fuel and is done to reduce emissions. That said it also makes the piston much less durable under increased combustion temperatures.
My recommendation is to continue to "love" your current combination... obtain a "spare" engine (a spare transmission is a good plan as well). Rebuild the spare engine with boost friendly pistons and rods. Once completed swap this boost friendly engine into the truck and THEN you can explore higher boost performance. In addition begin studying and learning about fuel and spark control so that you will be able to choose and either tune or have tune to support your goals, project, addiction!
Oh, and save the now "spare" original engine. Just because you have a "built" engine does not guarantee it will not have a failure... due to tuning problems and or an overlooked assembly issue.
Now, in consideration of your first question. Yes, a pulley change will change your boost. A smaller supercharger pulley... a larger crank pulley... or both will increase your boost. Most usually just do the smaller supercharger pulley although belt slippage can become an issue. As far as pulley sizing there are online calculators... do a search as there are many considerations worth reading about on that subject.