RNG is RNG, but some items are incredibly strong. Much stronger than others.
I've played a bunch of 1v1 and if one player gets an Adrenaline it swings massively in their favour. Items can never be drawn completely equal, that's fine. But we had rounds where it was possible for one player to completely lock out the other, with no opportunity for the opponent to play due to items and combinations that were possible due to Adrenaline.
A suggestion might be if you have one Adrenaline you can't draw another? Or you can't use two in one round?
Playing 10 or so 3 round games, it felt towards the end it was more about the items we got than it was about the shells.
And the item that stops another persons turn, shouldn't appear in 1v1 games. Way too strong and compounds Adrenaline power.