Bit late in the day BFWIW I have the 6 through to 10 wt in the Xi2. I buy the blanks and make them how I want them with ceramic guides etc. The 8wt and 9 wt are very good rods. They load up nicely and have plenty of umpgh in the butt section. I purchased my Xi2's just after the RPLXI's were obsoleted. At first I chased around like a mad thing trying to buy the RPLXi blanks but gave up the ghost. I am glad I did. My view is that Sage learnt a ,lot from their previous range of salt water blanks and that the Xi2 is in my opinion the better rod. I prefer not to go backwards.
You may find the old design still and may prefer it. Still a good rod.