Let is sit in secondary for a while, there is no need to rush the process. I usually transfer to secondary then rack after 30 days. At this point you have dropped out most of the heavy lees from the juice. Check your sg and if it remains stable for 3 days in a row you can add kmeta and sorbate to stabilize. I usually don't stabilize until I'm sure the wine is clear. I will wait a week or so after stabilizing to back sweeten. When getting ready to back sweeten I determine where I want to be and how much sugar to add using the program winecalc(can be found on the forum). I'll add slightly less sugar needed into the wine and make a simple syrup. Add this to the wine, mix thourougly then sample. I'll allos this to sit and see if it is to taste, if not add some more simple syrup.