I can't believe you've already put it together.
The boot times are, indeed, a problem. Gigabyte seems to have nailed them pretty well, while MSI is the worst one (at least those were the results TechSpot got with their B650 motherboard round up). That said, I read somewhere that Asus boards had to re-train the memory with every boot unless you changed some setting in the BIOS. I'm not sure if that's correct but, if it does bother you, you could try to find more info around the web.
From your words, it looks like you got what you wanted, higher and more consistent framerates, even if the fewer cores may bite you in the back from time to time.
Well, congratulations again for your new rig.
Btw, are you really complaining about the lack of stickers? Really? 
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.
