One of the taught techniques for poor weather is 'slow, safe cruise' which is a medium flap setting and a reduced speed. The slower speed gives you more time to see and react to what is ahead, and the flap deployment will give you a greater margin over the stall, and give a lower nose attitude improving forward visibility a the lower speed.
So all you did was fly your leg in a slow safe cruise configuration. However I would suggest that flying at say 10 kts below Vfe would be kinder to the flap attachments and linkages.
Re the 150 mile , comment, I think it refers to the comment re a qualifying cross country which should be 150 nm and 2 intermediate landings