right
using Innovus with high extraction accuracy increased the runtime, so the trade off is to update the R/C factor to be close with less run time penality.
The "signoff" innovus extraction can be used to do a pre-eco hold/setup, but I always prefer to used the ECO given by PT into innovus to fix the DRV, hold & setup violation.
and if you provide the DEF to PT, it can directly select the cell to add or to change + the position to minimize the routing impact.