I would still highly suggest playing 6 months of unrestricted tournaments with escalation, knights, and strongholds all included. Per GW, those are core products to be used in standard games of 40k. All of the "whomever buys an expensive model will win" arguments currently have zero data to back them up. Apoc is a different game, with different circumstances (many more points, multiple players/codexes per side), and so doesn't really count.

Play unrestricted for 6 months, give players time to adapt to the meta. After 4-6 months, then add in comp or other balancing decisions if they are necessary.