The Reef Octopus Regal 150INT is only rated for 210g with a light bio-load, 100g with a high bio-load. I wouldn't look at something that is on the "minimal" size. The 200INT is rated around 250g with a medium bio-load...this would be more in the ball park for a 220g tank. Most prefer overkill for skimmers since you can always turn them off, if skimming too much...but you can't run them over 24hrs if they aren't skimming enough!! But, you are going to have to find a footprint that fits your current sump configuration....1mm doesn't give much room for error! You will need a bigger sized skimmer for that tank...you may have to reconfigure your sump once you get an idea of the skimmer footprint you need.
Have you looked into the Tunze skimmers? If not, definitely an option....easy to use, great engineering, very good price points for the size skimmers they have...also pretty good footprint sizes for their skimming abilities. I have the DOC 9410 and really like it...it's rated for up to 266g and I use it on around 100g total tank.
https://www.tunze.com/US/en/product...tml?user_tunzeprod_pi1[predid]=-infoxunter007