Synthesis Window

I have been generating composites using a synthalf parameter of 25 days, however there are sometimes during the year that there are too many clouds to get a clear composite, I was wondering if there are any guidelines to select this synthalf parameter, for instance what are the tradeoffs of using a larger or shorter window? I also noticed that there are some L2A products within the composite window that are mostly free of clouds, will selecting the synthesis date to those products’ dates improve the composite? Thank you for any suggestions you may have about this topic.