I have tried both your sets and have found them fairly useless (no offense). There is, however, a set I have run into that I then imitated and abused to all hell. Here it is, what I think is the best bulk up set in the game:
Bulk Up Rest Scrafty @ Leftovers
Careful Nature
Shed Skin
252 HP/252 SpD/4 Atk
Bulk Up
Drain Punch
Payback
Rest
This set is absolutely amazing. I have gotten 6-0 sweeps with this thing if the enemy team has nothing to counter it. The general strategy is to get 4-6 Bulk Ups so that your attack can reach above the 600's. From there, Drain Punch to regain your health and Payback ghosts.
Toxic can't kill you, as Shed Skin will get rid of it easily. Burns will also not work. Basically, you are immune to status in the long term. In addition, Shed skin has the wonderful ability to end Rest before to turns are up. There is about a 45% chance that rest will end after 1 turn instead of 2! Rest can also help you set up, as you won't need to exclusively depend on Drain Punch.
As for the EVs, they are obviously meant to boost Scrafty's defensive capabilities. Since Bulk Up can already raise his base 115 Defense, 252 EVs and a Careful nature are used to boost his Special defensiveness to extremely high levels. Once, I took a Hydreigon's CRITICAL surf in the rain, and lived with 20%! Now you may say that this makes him too weak offensively; but the point of this set is not to boost once or twice to sweep. It is intended to have very long staying power, and is able to potentially take down entire teams. The remaining 4 EVs can be put into Atk, as 1 Speed point with 58 base speed won't help outspeed anything to my knowledge.
However, Scrafty can be killed easily before he sets up extensively. Scrafty's main counters are flying types. Keep in mind that this set must ONLY be used after all of Zuru's counters have been eliminated. Once all Flying-types and Powerful Focus Blasters (like Infernape) have been downed, the remaining pokes are easy pickings.
As for this pokemon's counters, they are relatively easy to predict and take down. First of all, Swords Dance Gliscor can switch in on a Bulk Up, and set up before Scrafty can raise his defenses high enough. However, he CANNOT kill Scrafty once he gets 4 or more Bulk Ups. Pokemon like Zapdos may also have this ability (though its riskier). Another way to kill Scrafty is to send in a pokemon with Focus Blast and revenge it (although he will probably live it if hes at max HP). Finally, fast Fighting-types can kill it with a STAB Close Combat. However, once again, a few Bulk Ups can remedy this (an example is that I took 20% from a CB Close Combat from Infernape once).