Chest protector problem and question

I have a great Alpinestars suit I have been using and the Tech back protector with it. I just purchased a Bionic 2 vest that has a back protector built in that just zips off. I dont understand why but its a medium, which is the same size as my A.S. Tech back protector. For some reason its 4 inches shorter and doesnt cover my whole back the way the Tech Protector does (the one that comes with the Bionic 2 Jacket).

Also I can't get the suit on with the armour thats already in the shoulders and the elbows of the suit, and have double the armour cause the Bionic 2 Jacket comes with it in the shoulders and elbows. I cant really find any way of getting this stuff out of the suit, and I was wondering if I should just cut the arms off and use it for just a chestprotector, and use my old Tech Back protector for the back.

I can't find a way to get the built in armour out of my suit and dont know how, and if its even worth it. Should I just cut the limbs off this vest. I really wouldnt be that mad seeing as I got this thing for $185.00 (usually $239.00)on ebay and its in perfect condition, I just wanted something more for my chest area.

I did notice the post from the other day and I was wondering if anyone knows of a good just chest protector, then I could resell this thing. I really dont want a back protector built in and the one a few people recommended before are not approved. If you can recommend something thanks, and if not and I find something else and your interested in this Bionic 2 Jacket let me know I will sell it to you for no profit on my end.

Thanks