Yeah, individual tranches don’t matter. Your latter ones will always be the huge ones that make up for a 1st one.
You could always consider selling and locking in those gains. Any respectable gains you want to lock-in (besides SLV, XOM) before the next market sell-off, you might go ahead and consider doing it.
So, if you’re up 15%, 20%, 30%, etc. on your positions overall, you could lock-in whatever you wish.