I think that if you need adjustment you can do one of two things to get it:
1) us an exacto knife to trim the tab off the position indicator to get more room, or
2) let the position indicator not sit in the channel but sit on the deck of the board - you might do this for a run or two to see if you like the new setting and then go to #1 above.
This seems like a design flaw to me the indicator shouldn't hold you back from adjusting.
I am getting my diodes next week and will have a look at this too
Something to try at least, let me know how your setup looks when you have it done please.