Honestly, I'd score better using an 8 iron for all my shots that travel 8i distance and lower than I would playing a 9, W and UW/SW that are the same length a an 8i.
If I ever tried SL again it would be:
Driver (Std length)
5 FW (std length)
5h and 6h (std length)
Single length 7i, 8i, 9i (8i length)
Wedges (std length)
This way I would only have one over-length club (9i), but only one under-length iron (7i). I suppose it's possible to have thr 5h and 6h be under-length SL clubs, if I found I could launch them high enough.
I tried before and I could not launch the 5i, 6i high enough to be of any value.