Just a follow-up to my earlier post:
Tech showed up right on time, very knowledgeable and courteous, and when I mentioned SatelliteGuys he treated me even better!
He replaced the J2's with J3's, double-checked all my previous wiring, and was finished in about 45 minutes (that includes us chatting about tech stuff during the swap). He even offered to replace my main line from the node to the H3 since the RG6 was a little old. We figured out it was rated for 3000Hz and I wasn't really having any problems so I told him to leave it alone. Re-running the line would have taken another hour and it was near the end of the day so I didn't want to bother him. Besides with the Protect plan I can call in the next 3 months and get it replaced if I need to by requesting a "cable reroute".
So far after about a week I am pretty happy. The J3's are definitely faster than the J2's and have a slightly better picture. The only thing that disappointed me was I thought they would come with 54.0 remotes but they only come with the 52.0. Dish is running a special where if I bought a silicone skin for $15 they threw in the 54.0 remote. We really only have 1 Joey in a dark room so I only did that one. I don't like the 52's (have 40.0 as backups on all of those) but the 54 definitely has a better button layout and feel.
P.S. -- I now have an almost-new 52.0 and also a new 50.0 (touchpad) for sale. If anybody can use them shoot me a message. You pay shipping and a small fee to help me fund the purchase of more 54's for the other 2 TV's