I asked several of our state forestry guys (over the years prior to cutting, they changed)
about their recommendation as to replanting.
I was ALWAYS told the same answer,, do not replant.
The land will selectively grow the type tree best suited for the land.
pH, nutrients, water,, on and on,, will cause a natural selection.
Planting goes against the natural selection.
The trees that were there at the clear cut seeded the land at a rate of thousands of seeds per acre.
That is pretty stiff competition.
Also, water sprouts, or whatever they are called, grow off of the old stumps.
THOSE trees have the best chance to reforest the land, because they have a HUGE established root system.
I was told to wait so many years (I think about 10) and walk the land and spray any tree not wanted.
I know the OP planted pines, that may be what is the perfect tree for the land.
Our research, as well as what the foresters told us, was that South America sends finished dimensional lumber to east coat ports,, for less $$ than the cost of removing the USA grown pine type trees from the land, not including saw mill costs.
There was several articles around 2016 that were written about people that were growing forests.
ALL of the people growing softwoods were finding ZERO market for the trees.
I am sure that will change,, but, South America is tough to compete with.