welcome Bigwig. Congrats on the new LM. As stated, shifting "pains" are common with the bikes. Linkage tuning is usually all it takes to smooth it out like butter. Either external, with cleaning, lube, and adjustments, or (and) internal - the transmission shift pre-selector plate, which will most likely 'eventually' need a going through with an updated pre-selector spring, and some finessing of the arm, etc. Don't be shocked, all the answers are here on the forum.... someplace
start here ...