Guys, let me start by saying I've been researching RAM flower attributes for the last three days both in inventory and on the ground
Genotype, visitor watering, gold sparkles, golden can bit, we got it all figured out
You have the right ideas but are mistaken on a couple of points
Your genotype is off: the hex pair that codes the 8 bits for the genotype goes in this order: SSWWYYRR
Black rose is 03 for example
Purple tulip or hyacinth is 0F
White tulip is 10
Also While you are right on the rough position of the days without breeding, it's actually coded on 5 bits and then it's the beginning of the visitor watering table
10 bits are are bitmap of visitor watering, last one is for rain/villager/own watering (the 80 you found)
The 80 watering marker is correct but only for a flower that has been dug up and replanted the same day ; you will never have in a legit fashion a flower with this bit and a counter of days without breeding
This has to do with the game handles rain and watering
You want a gold sparkling flower ? set its attribute to 0083E0XX in the inventory and plant it (XX is the genotype)
You want a flower that will reproduce the next day ? set it to 0003EFXX and water it yourself
Don't dig them up or all the attributes are wiped
By the way, the game doesn't mind "GMO" like a white tulip with a OF genotype. It will happily reproduce and give purple tulips.
Last point: I don't recommend changing attributes in the ground, the game does not appreciate because of how many replications of the same flower code there are (half tiles and whatnot)