The simplest solution seems quite obvious to me after a few days of play. When Vikings landed in England, they were amazed at the fertility of its soil, and the great wealth and technology of the Saxons. Boost the mainland economy. Give the Saxons the tools they need to power through the grinding stage at the beginning of a PW character. I have a few issues with how the Vikings seem to ALL be able to tincan, as historically speaking only the most wealthy warriors could afford chain suits, but I can write that off as a game wanting certain factions to have unique strengths.