Hi Harold,
Done some decent share of fishing with these sinking pencils (sometimes also referred to as lipless minnows), not only with the mentioned Wanders (LC) and Blues Codes (Maria), but others like the Bankroll (Dice) and SlideSwimMinnow (Zipbaits) as well. I don't have the Reef Pencil (Hart) however, so I can't comment on that one.
You can fish them several ways:
1. Just cranking or winding them on a steady retrieve, they develop some sort of S-movement just below the surface (slow) or on the surface (faster). Don't find this movement very convincing though, but that's a personal thing I guess.
2. You can twitch/jerk them just like their counterparts the floating pencils (stickbaits/pencilbaits): with a fast retrieve you get a WTD on the surface, a subsurface WTD on a slower retrieve with regular short pauses.
3. I also tried to fish them somewhat deeper in the water after counting them down: most of them have a very beautiful fluttering action on the drop, which I find really very convincing I must say, but unfortunately they quickly resurface when you start twitching or jerking them: therefore you need frequent and long pausing to fish them this way.
Maybe I should have given it more time, or should have tried a more 'sink and draw' type of fishing, don't know, but I never really got the hang of this latter type of fishing, so I lost my interest and switched to sinking (bibbed) jerkbaits instead. Had good results with the B'freeze 78S and EXS (LC), Nabarone Stuka (IMA), the Athletes S and Artists (Jackson): they usually lack this beautiful fluttering action whilst sinking, but IMO this gets satisfactory compensated by a much more beautiful upward darting action (very convincing!) when you start twitching/jerking again after pausing.
So IMO the main importance of these sinking pencils, in relation to their counterparts, are therefore: the enhanced casting distance (i) because of the added weight, most of them are 'silent' (ii) because of their fixed weights (although I do belief the Reef Pencil has a shifting weight), and (iii) the possibility to fish them subsurface.
Hope this helps.