Deployment strategy for daytime deployment

I'd suggest looking at one of the connection based load balancing methods available on the LTM, such as Least Connections. You'll also need to decide how to "disable" the 10%; long or quicker connection drain - see node State, either Disabled or Forced Offline for details. The drain process will also depend on your application, so test.

We've done similar on Exchange CAS servers; disable them at the node level so they are disabled in pools, maintenance, re-enable, move onto next batch.

Hope this helps.