Add this to the equation: higher HRV and low RHR is not always a good sign sometimes they indicate burnout. So if you had a period of higher HRV and low RHR and then during your deload week you noticed the increase in HRV of technically could mean you are recovering to your baseline.
Despite the popular beliefs the HRV works more or less like a hockey stick curve:
-> after intense workout you HRV drops
-> then during recovery it decreases
->then it settles hopefully slightly higher than your baseline (adaptation)
Now if you mistake the increase with recovery itself you risk overreach and the consistently high HRV is just your body’s redaction to stress by aggressively switching to parasympathetic system. You can asses this by noticing lower than usual heart rate in your training or you cannot push your hr up not matte how intense your workout is, that’s the burnout sign.
This all assumes you’re are not injured or sick. Talk to a PT or sport cardiologist and do some basic checks to be sure.