So I've been wrapping my brain, reading posts all over the internet. I can't seem to get a clear answer on back joints when getting as low as you can go. I've been looking at the Proforged Super Extended Uppers and it says that they are made for laying frame with bags. My question and lack of understanding is the lowers. The lowers are listed as tall, but say they can limit travel. Are the stock lowers used when using the super extended uppers, or the talls used as well. I'm going to actually call proforged on Monday, but was wondering if I can get some answers on here. Any info helps. Thanks in advance.