Moto Blue Underdrive Pulleys

Hey everyone I purchased these Moto Blue Underdrive Pulleys like a year ago and finally installed them "not on my truck", but on my mom's 04 Chevy Avalanche. It is pretty much stock accept for a K&N drop in filter, TB bypass, removed foam inserts and my old Hypertech III programmer.
Anyhow to keep the story short; my dad ended up with the pulleys for some parts swapping we did. So now the Pulleys are installed and is really noticeable when accelerating. Infact it is more noticeable on the 5.3 than it was when I installed a set on my old 90 model Chevy 5.7. Shocking! Not what I expected.
Just trying to get as much power out of her Gas HOGG Avalanche with out sacraficing MPG. Plus they are headed to North Carolina with the bike trailer and 2 Streetbikes... a lot of weight.
Anyhow I just figured I would post this note of info... my truck will be done in the future, but I am going to stick with ASPs.

I would look into Trick Flow.

i dont like asp,they suck,SLP FTW

Why Trick Flow or SLP? The Trick Flow through summit is the same as the MotoBlue from what I researched. Why not the ASP? Is it because it came apart on you? Wouldn't the smaller diameter and lighter benefit a motor more than just a smaller diameter? I was going with ASP, because that is hat was on my 5.7, then my dad's 5.7 and now on the 92 model 5.7...

ive used ASP on about 7 vehicles and ive always had good luck with them.

ive had asp on mine for a LONG time... no problems here

Are March pulleys any good?