Disc brakes still not stopping good

Using braided stainless lines on the calipers and the ssbc kit came with braided stainless lines on the rear end housing. Can they bulge?

old school lines bulge, but with stainless you have that covered. I would still give rebedding them a shot before I swapped hardware. This is what I have always followed with great results...
Bedding in Brakes, Zeckhausen Racing