If I designed a currency, never would I make the initial distribution so much higher than the long-term.
If the currency starts from zero, there has to be a high initial daily inflation to get it going.
If it does not start from zero, it is called "premine"
That is true but what is the second 6 months debasement for Monero? I will be happy to mea culpa if it is not that high?
Or more specifically is the nominal block reward declining?
Yes, nominal is declining. And percentage is rapidly declining. After 12 months the percentage is something like 0.2% per day instead of 1.1% as it is now.