Very new to bps but I already love my lil guy

[Craiga 01453]

It's good to let Balls feel safe and relaxed by giving them their alone time, but a small reminder that too much alone time is not helpful at all. The snake needs to know they're safe and that you don't mind that it gets grumpy occasionally.
You should definitely be waiting at LEAST 24 hours after feeding to bother them again though (as others have said).
As much as leaving them in their tank for 3 feedings (3 weeks seems way too long and detrimental to bonding at this age) seems to be a common theme for what people are saying, I would say leave them alone at max a week if you feel it's extremely necessary.

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Husbandry and feeding are your top priorities with new, juvenile snakes. BPs are typically very docile by nature, which is one of the major reasons they are so popular in the pet trade. Some juveniles can be anxious and nippy, but will almost always mellow out over time. Getting your snake on a proper feeding regimen should be of utmost importance, especially with juveniles.

BPs don't require handling and merely tolerate it.

As far as waiting 3 feedings, it gets your animal on a regular feeding regimen, which can be a lot more tricky than handling and cause a lot more stress and headaches to both the keeper and the animal. In the world of a BP, 3 weeks is nothing, they are more than happy to go three weeks without being handled, they will live 30+ years if kept properly. So rushing to handle your BP is not suggested, we handle for US and US alone. Our BPs don't look forward to being handled, they merely tolerate it. As for waiting being detrimental to bonding time, I have to disagree. There are plenty of snakes who are primarily breeders and almost never handled, who are then sold as adults to somebody who will keep it strictly as a pet. They have no problem being handled at even a few years old, despite not having that precious bonding time.