780 is hard to get. My score goes from 790-750 on a normal bases depending on when the score is run as that can and does affect my credit utilization. Hit me at this time of the month it is the worse as the it is right at the end of a billing cycling but before last months statement is paid. That puts me at a nearly a 2 month load. The 750ish range come from if I have some large planned purchases on my card as I want my CC benefits. Balance is aways paid in full.
I pay my loan in time. I aways pay my CC balance off in full. Having a sub 10% utilization on a normal 2 month cycle is normal but if you have my entire living room and bed room on ones CC bill it is much higher utilization. But utilization is a snap shot in time.
I currently own a few other credit cards, but recently got the Chase Sapphire Reserve 2 years ago and a Chase Unlimited last year. Prior to obtaining these credit cards, I was at 830 or so. I think right now I am still above 800. It's not just about paying your bills on time or having a 10% utilization.
You also want to grow your max cap accumulatively on all your credit cards. Someone who has 10% utilization on a max cap of $10,000 across all their credit cards will probably have more volatile fluctuations than someone who has 10% utilization on a max cap of $50,000. So if a credit card company asks if you want to increase your balance cap and they don't do an inquiry, just do it.