There is close to Goslawice in the Zakrzewo gmina a village of Sluzewo (Sluzewo rather than Sluczewo). The church for Goslawice was in Siniarzewo and the church for Sluzewo is in Sluzewo.

It's possible that some of your great-grandparent's children were born in Goslawice, so you need to check out records for the Siniarzewo church. Probably, Stanislaw and Michalina got married in Sluzewo because this was a place she had lived before getting married.

The vital records of the Siniarzewo and Sluzewo are preserved. I assume you will find records you are looking for.

There live many Pluskota's in the Aleksander Kujawski area. What confirms that Goslawice and Sluzewo can be right places.

Michal