Be able to track Demonic Pact as Demo Warlock so when you get a good spell power proc, you can send the pet and benefit the raid, while also pulling your pet back so it won't update the raid buff with a lower amount of spell power.
The Demonic Pact buff, lasts 45 seconds, but it can be refreshed after 25 seconds as long as the pet hits a target and crits. So make sure you pull your pet back when you have a buff with good amount of spellpower.
Use this WA along with the macros:
/petfollow
/petattack
This way you can min/max the uptime of the big spellpower procs.