Granted, I've never shot the stuff, but that is weird ammo!
How can you discount the possibility of fliers in that ammo? it says that "Case / 3.5-gr. bullet are molded of blue plastic, they separate when fired." Seems like you could get fliers all over the place since the plastic is moulded together. it would probably shoot like an excessively tight crimp.
Try some WWB (winchester white box) from walmart. about $10 / 100, but it is 115gr FMJ real ammo. I'd much rather have 400 rounds of real ammo than 1000 rounds of plastic at 14 foot-pounds energy and accuracy to "50 feet". At 20 yards (60 feet) you will have a lot of fliers with this ammo.
Chances are, this ammo is exaggerating any errors you are making. You may shoot better with real ammo.