CT , while I do not have the 15' 8/9 MKS , I own the cousin to this rod , a 15' 8/9/10 Highlander (same grain window) , it was my first Meiser and so began the addiction :hihi::hihi:
For a mid belly , I enjoy my precious 11/12 Ian Gordon lines at 75' in floating , intermediate and slow sink . The weighed I.G lines come in at 842gr , 828gr and 807gr respectively . I found the 9/10 CND GPS was just okay on this rod . I also use an older version 9/10 Delta Long that is nice , but compared to the I.G lines , not as smooth . I bet a 9/10 Nextcast Fall Favorite or Winter Authority would be a good choice as well . The Delta II's have caught my interest as well for this rod .
Steve Godshall made me a couple Skandits with floating and intermediate bellies and are multi-tips . The floater is 43' @ 632gr and the intermediate version is 40.5' @ 607gr . Both take the same 15' Rio 11wt tips in all densities and cast like butter on both heads . I chopped back an old intermediate and intermediate/Sink 4 , 11/12 Vision Ace heads to 40' @ 617gr and they too are pretty sweet .
I have a 680 Scientific Anglers Extreme multi-tip Skagit for this rod and though skeptical at first for using a Skagit on a 15' rod , I am quite pleased with the performance of this match . Throws anything and everything I tie on the business end with ease . Just really need to slow down because the 27' head can be whipped around if you don't . I thought about a cheater set-up but decided that by just adjusting my pace I can over come the issue . Works awesome when you really need to get out there and are against a high bank or can't wade out far enough from that overhanging brush .
Hope this kind of helps
Mike