Ultegra Di2 change from 11-28 to 11-30 cassette

Hi all,

Sorry for what is likely an easy question. I have Ultegra Di2 R8050 - and just changed my cassette from an 11-28 to 11-30, which I understand is doable within the short cage rear derailleur hanger.

After changing, I can tell the alignment of the chain is just not "perfect" as it was before. 

Do I need to look at adjusting the alignment via adjustment mode, or is there something else I need to be telling the Di2 via the computer connection? 

I made the new chain the exact same length as the old one - which I assume is correct too, but please let me know.

Thanks!

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