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Ideally the flooring should be tested with a moisture meter and compared that to the moisture reading of the subfloor. When the two reading are in agreement you are good to go.
Some flooring however can take a very long time to acclimate. An example of this is with dense tropical hardwoods. A number of years ago I installed some Bolivian Rosewood in my living room, this flooring acclimated for about a month before I installed it. I later installed some more into my library....that flooring acclimated for over a year.
I can tell the difference in the install...the living room is not as tight as the library. The difference is small but noticeable.
What type of wood? and is it pre-finished?
Is this what you were looking at?
A Janka rating of 2300 is pretty darn good. On issue with wide stock ( 5 " or so) is that it can show shrinkage and expansion a bit more than narrower stock. Narrow stock has more "edges" that can adsorb the shrink.
I did my master in Jatoba ( brazilan cherry) which has a close 2350 rating...I've been very pleased with it.
For wide stock be sure to acclimate it well...at least 2 weeks before install
There is very little that can be done during the summer to control Poanna other than to regularly mow the grass to reduce seed head numbers and improve uniformity. Poa is a true winter annual plant. It germinates in the fall, produces seed in the spring, and dies. The plant is nearing death in late summer, so any attempts with post emergent control at this time are pretty much pointless.