i'm having a problem with the armor i got the ab and back together but when i go to put on the chest and back the helmet touches the straps and pushes upwards.i'm sort of large size i have a size 20 neck 16 biceps and17 calves i'm about 245. am i doing this right.the ab and back have the shoulder straps criss crossed and i used the snap and buckle.the chest and back i used clamps to get the right size and every thing i tried the helmet hits the shoulder straps and yes i have no neck.any advice