As for trolling rods for pulling crankbaits, while I thought that my two 7' trolling rods that I use on the inside pair might be a little on the power side (medium-heavy, these were given to me and not purchased), I'm not sure how the 10' B&M Pro-staff that I use as the middle pair would have handled the 8lb catfish that my daughter caught in the fall on a Bandit 300--the trolling rod handled it like a champ. I don't think that I'm getting fewer fish on these compared to the pair of 10' B&M Pro-Staff or the 14' Southern Crappie Trolling rods that I use for the outer pair. One thing that I do know is that my kids do prefer the weight and feel of the Pro-Staff over the others two pairs; it's just what I could get at the time when I started pulling crankbaits this past summer.
As for spider rigging, I use a pair of 16' B&M BGJP, a pair of 14' B&M BGJP, and a pair of 14' Crappie Thunder jig/trolling rods, and this is based on what was either gifted or I could purchase at the time when I was upgrading from trolling with 10-12' rods. I typically net my fish instead of trying to jerk them into the boat, so I'm not really taking advantage of the stiffer action and extra power over the BGJP. I also don't think that I catch more fish with a particular set of rods in this case as long as my presentation and lure are what the fish want.
If I'm not at work or taking kids to their activities, you might find me on "The Rez" fishing. If not there, I could be in the garage working on my boat.