Considering a wheel swap - what should I know?

Hello
I have to downgrade the wheels to 16" too. There is so much different stuff in my city on the road that the Kojaks cannot last long time. I need a better shock absorption as well.
So I have decided to downgrade due to better assortment of 16 " tires and prices too.

I have a quesition I hope you know the answer for:
How often the spokes break down in 24-spoke 16" wheel?
I am 186 cm tall, about 90 kg weight. With clothes and backpack I propably may reach a 100kg.
I have already made a one spoke broke in my 18" rear wheel, but that was a time when I rode Strida a lot trying its possibilities.
I have a saddle set on the pre-last postion, almost on top of the frame so the weigt of mine is about 60 percent on the rear.

What I may expect how the 16" wheel will behave?
I am going to put the Schwalbe Big aplles on it and install strida rear hinge upgrade kit from Strida Canada from Bill, I have ordered it already and waiting for delivery.

Best regards
Greg