My advice is to wait until next year to start splitting hives. The honey flow is on strong and looks at the math. If you started a split now, you’re looking at 90 days for them to get a strong hive going, make honey for winter stores and draw out whatever they need. Needless to say they have 90 days just to come up the strength to start the rest. Time is not on your side, the old adage a swarm is May is worth a load of hay, a swarm in June is worth a silver spoon, a swarm in July, throw them away.
Works out.. If I were in your shoes I would stick with what you have and make sure they are strong and healthy for wither first then think about expanding.
Beechgrove