Rather with strong masters. I don't see what could make Poland stronger than OTL in any CP victory scenario:
-Poland wouldn't have seaport
Poland wouldn't have Posen, Pomeralia and Upper Silesia, which were and still are the wealthiest parts of the country. Poland would also likely lost border strip to Germans and Chełm and Podlasie to Ukraine.
-Under Ludendorff and Hindenburg German Empire became quite radical, so it's possible that it would be NO Poland in CP victory scenario and Polish nation by 2013 will be some ethnic curiosity in eastern frontiers of Great Germany in some enclaves in Lesser Poland, but even in best possible scenario Poland in CP victory will end as country size of modern Hungary-hardly a power. OTL Poland definely count better as power than in any hypothetical post-CP victory.
Well, Poland (unless it has the Ukraine) will never be a first tier great power with any POD after 1900. Poland at best is a second tier power. Now to your objections.
1) Seaports - A-H used Hamburg as it main port for imports, and was a Great Power. Sure a seaport is nicer, but not required.
2) The wealth of Silesia does not make up for being over run. The value of allies outweights these gains. With a strong ally, Poland is defensible and can develop economically over time. This idea of Poland versus the world shows up a lot. Poland has to have a strong ally as a neighbor. Pre WW1, we can chose between A-H, Germany or Russia. After WW1, we have Germany or Russia as the choices. The basic choices are not having the lands in west and having Germany as an ally. Not having land in east and Russia as ally. Having both German and Russia with a grudge. We know how the last option plays out.
3) Far from clear Germany takes a border strip in a CP win - lack of German settlers to live their, adding more Polish voters, problem with Polish party in parliament, problem with Catholic party in parliament, cost of occupying.
4) Now sure there are some horribly time lines one can write for Poland, but it is hard to top OTL for suffering. Especially if one counts the Jews, who were also citizens of Poland. Now the best case is a Poland that goes farther east than OTL Poland, but does not have West Prussia or Posen with a Hapsburg King.