Have used it for couple years now. The full size version only (I think there are three sizes now?). Interesting bait. I have never added anything to the tail eyelet, but have hung a light weight off the chin. It definitely helped it sink faster but didn't do much with it that way so I use it the way it arrived (which is probably a mistake). I don't think this bait needs anymore drawing power than the swimming motion and appearance that it comes with -- Adding a blade is worth a try I guess, but honestly, don't think you really need to unless you're fishing dirty water in which case, maybe another bait is a better option? However, try everything that you can think of, it could be the ticket. No rules..
I use it on a swimbait rod rated 1-4 ounces, 300 Curado E and 20 pound fluorocarbon line. Long cast, slow retrieve with occasional twitches - play around with retrieves to see what works for you. The bait swims nicely, definitely draws attention and if you look at the bait from an engineering standpoint it's pretty impressive. The pectoral fins are the diving plane, it floats upright with just the back barely breaching the surface, rotating trebles, and as you mentioned - options with add-on components are a plus if you ask me. Quality rings and hooks too.
Lots of follows and caught a few fish on the bait. It dives roughly 3 feet or so on a long cast (with no weight added). Cool bait overall and would recommend giving it some water time.
Good luck