Difficulty shifting into Reverse and 1st.

2011 Nismo#91

So starting this weekend I am having well more then just a little trouble to shift in reverse, it's almost impossible sometimes and requires a lot of yanking. First is similar but not as bad. The other gears are a bit difficult but nowhere near as bad as R and 1. I have replaced my clutch, flywheel, and CSC elimination kit from Z1 recently. Which was fine after a little adjustment to get it to shift into 5th and 6th. I have read it may be the synchromesh for those gears but not sure if it could be something else. I did do a 2 track day weekends recently but I don't see how reverse would be so affected.