I added the hellwig bar and adjustable links since my lift was so big and found a major improvement in lean like you mentioned. The oem bar with extended links would probably work just as well. 80% of my driving is highway like yours and much more stable in my opinion
No sound deadener but I guess the rain guard kinda acts like one. There is no movement at all in the hood at high speeds. Much tighter than the stock hood
Iāve seen a few guys use hood struts with no problems. The holes arenāt there but using either a small self tapping screw or drilling a pilot hole is very easy