So today I did some experiments as some of you've suggested.
I took some photos to better communicate with you folks and hoping to get few pointers.
Here is the first puck using Pressurized Portafiliter.

Photo2 with the NPP and the same double basket

Sideview.. trying to show that I was lighter in dose (didn't get the scale yet, store closed)

Side by side

I didn't take any photos of the espresso with the first two shots but on the third which I did the same thing as the 2nd shots [NPP and lower dose and same tamp] I got this result:
I separated the first 8seconds espresso from the rest. Those shot glasses are not standard espresso glass. There are approx 2.5oz glass.


So, the taste was about the same when I tested with PP and NPP use on the same beans. They are not fresh beans, about 2wks old.
Questions:
Did I dose too much on both shots? [Judging from the pucks]
On the 2nd attempt, are those channeling effects at the center of the puck?
By this wkend I will definitely get myself a scale. Any other suggestions are greatly appreciate.
**Drdna:
May I ask you a favor to either PM or explain on here the steps of using a mason jars to store your beans?
I read the old post but I'm still missing the steps.
e.g. how do you chase out the air/oxygen from the jar while you have the beans inside?[a low-tech way if possible]
What size of jar do you prefer to use? I know you prefer not to store in a freezer. Can I store mine under kitchen cabinet liked area with little changes in temperature?
Thank you once again to you all..
Happy New Year .