Refusal has been on and off most of her life.
We were once on live only, but I just don't like doing it. It ended up being a hassle if she refused live and I had to deal with moving the rat to another cage for another animal.
Last year she did well and took F/T with a vengeance so that's where we're at now.
She doesn't lose weight and I'm content waiting her out.
If I leave the F/T rat, I shut off all the lights and see what happens in a half hour, which is always nothing.
This snake typically eats 5 times a year which is a bit less than the boa constrictor here. He eats maybe 6-7 times in a year.
The carpets are a bit different, the Bredli is younger and doing some catch up eating so he's about every 10 days probably until fall.
The coastal is once a month, maybe less if she decides she's not into it.
As long as your Royal is not displaying any signs of illness or losing a lot of weight, I would not worry about food refusal.
Thanks for the nice words!