Welcome to the forum!
It is very difficult to abide to the manual's recommended speed for the break-in period. What my dealer/mechanic told me was that it was okay to vary the throttle during riding and wot was okay on occasion, though cautioned me against staying at wot for extended lengths of time. You will find varying opinions on proper break-in, ranging from those whom choose to only do what the manual says to "ride it like you stole it". I went with what my dealer said as at the time, I wanted to stay within his perameters to keep the scoot in warranty.
The breakin period will typically last for about the first 750 - 1000km. Within this period, my top speed was about 35mph. After break-in, my max was about 38mph. These measurements were in "perfect conditions", i.e. no wind on a flat surface. Hills would drop me to 25-30mph and a stiff wind (10-20mph) would have a similar effect.
It's a great-looking scoot you have!
Definitely stay with a 2 stroke mineral oil for the break-in period, though make sure it is of a decent quality. I used Bel Ray 2t mineral oil.