Problem of Too many FS Relations

Project: Typical Residence House Project

 

I am preparing a schedule of residence project. Construction contains 17 Blocks and each block has approx. 11 floors. So that too many activities and it s about to get 11.000 activites. 

 

Even i don't want but i use too many "FS relationships" in order to hang the activities in timeline and I know it will cause too many Out-Of-Seqeunce ("OOS"). 

 

1st Floor >>FS>> 2nd Floor >>FS>> 3rd Floor

 

In practical 2nd floor may start without waiting for finishing 1st Floor and that cause "OOS"

 

To avoid that i m thinking to use 1st Floor >>SS and FF and + LAG: 1st Floor Duration >> 2nd Floor. If 2nd floor starts before finishing 1 st Floor, it will cause a gap as 1st Floor Remaining duration for 2nd Floor activity but not OOS, I think. 

 

Doing SS + FF + Lag, what else may it cause a problem that I can't imagine ?