Also has anyone ever experienced their bat feeling lighter after it's knocked in and its in full flow in terms of performance? or it that just me getting use to the bat after a while?
Yes. It all about confidence in the bat.
The best example is the bat Hayden used to score his 380, he hated it for weeks, then pulled it out decided it felt ok that day and off he went.
The reality is that just using a different pair if gloves can make a bat feel different.
Half an oz is nothing. Use it in the nets and have a go. Once you start smashing it everywhere you will forget the weight.