Crucial drop shot rod choice?

[Fishbonze]

Hi noob here, been lurking for a little while, great site, lots of great topics being discussed!

I fish Smallmouths at the tip of the thumb in Lake Huron, 2-10 ft of water, wading, round smooth rocks and little vegetation / weeds. I have been enjoying ultra lite spinning with tube jigs 1/8 oz. - 3/16 for the last few years on 4lb test...rod seems overloaded a bit and not the greatest distance in casting, but love the way a 3-4lb feels on the lite setup! I am currently thinking that it would be nice to move up in length (6-7') and more power, I have purchased some senko's and shakey jig/worms to also try this season..I am currently looking at the Crucial drop shot rods from Shimano, I like the split cork handles on these, but am having a heck of a time deciding!

CRS-D68ML, Line Weight: 4-8 lbs. Fast Action. 1/16 -1/4
CRS-DX68M, Line Weight: 6-12 lbs. Extra Fast Action. 1/8 - 3/8
CRS-D72ML, Line Weight: 4-8 lbs. Fast Action 1/16 - 1/4
CRS-DX72M, Line Weight: 6-12 lbs. Extra Fast Action. 1/8 - 3/8

I read mostly where people say that the 6-7' M action fast tips are a good "all around" rod choice for smallies, but it seems like such a jump from the ultra lite that I'm used to, cant stand the thought of feeling like I have a broomstick in my hand...so do I go to the ML? or am I going to have the same issues of being under gunned? any thought you have would be much appreciated!
Bets, Steve