One of my best ever TFP months was on reserve. Sat unused one block, used for 2 blocks, picked up a single turn at premium. It was "easy" in that I didn't spend more than a few minutes looking through open time or fiddling with my schedule. Monthly block limits can really hurt your ability to pick up until you get through a few days of not being used, then trading and picking up becomes normal. The only real luck I had was that the one OT premium turn I picked up showed up in OT right before I went over the cap for the month but late enough in the month that everyone senior to me was over the cap. If I recall correctly I got close to 130TFP that month.

100-120 TFP on reserve picking up nothing extra seems reasonable, depending on the time of year of course. And there are plenty of ways to plus up a schedule even when on reserve.