Changing cassette ratio

Hi everyone, I'm hoping you'll be able to help. I have a 3x9 Shimano 105 groupset with a rear cassette ratio of 13/25 (circa 2005, I think 5500.) I would really like to change my cassette ratio to possibly 11/30 or 11/32. But after some searching it looks like my rear derailleur will only allow 11/27? I can get a 11/28?

If I turn my limit screw fully in will that be enough for the 28 teeth? There was mention of a longer b-screw?

Thanks in advance.

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