Conkeldurr's Standard set has an 85 Speed stat. Uninvested Dusclops with Neutral-Nature has a 86 Speed stat.
1. Give it 29 Speed IVs instead of 0 for every sets (bar Trick Room) in order to keep as much speed as possible and reducing Conkeldurr's Payback at the same time (84 Speed stat).
2. Change the natures from Careful to Calm and 0 Attack IVs for other Dusclops's Confuse Ray or moves that relate to Dusclops's Attack stat (Foul Play?). Dusclops doesn't even use its Attack stat, might as well make the sets extra-prepared for those situations.
3. Change the HP EVs from 252 to 248. You gain an extra Spikes-3 damage (71 instead of 70) when using 252 HP EVs.
These changes are really situational, but the point of those analyses is to show the most optimal sets for each Pokemon.
There is no need for 248 hp evs, as 'Clops will be Painsplitting hp back. It isn't like the damage is permanent. I really don't think the 29 speed IVs are worth the trouble; you won't be hitting Conklederp with anything, just Painsplitting/statusing. Same with the 0 atk IV thing.