No problem, I hope this helps you some. If I can ask, about how old/big would you say Paco is? He doesn't appear to be skinny. I might be concerned about a hatchling not eating, but adults can actually go for a few months. Plus a tub that size is perfect for a male western, but a lot of people say that smaller tubs help hatchlings feel more secure, so they'll keep them in something smaller just to get them started, then upgrade them to something more like what you have now once they're about half-sized or so. Perhaps it's easier for them to find and focus on the food when there isn't as much space to keep an eye on. Tub size definitely isn't a rule, just food for thought. I still think that temps are most important, so it's good that you're checking those. Personally my westerns do well with a hot spot of about ninety, an overall temp of about eighty-four, and a cool side of about seventy-eight degrees fahrenheit.
Anyways, you can place him in a cup with the pinky to eat so long as it's comfortable for him. (It shouldn't be so small that he's balled up, and I think it helps if he's not constantly forced to touch the food. I tend to see the most interest when they go around the cup and "bump in to" it.) An hour should be long enough, and sometimes I think it helps to keep them in the dark or at least somewhere secluded. If you think that the act of removing him from his enclosure and transfering him to another container is too stressful and distracting for him, then consider feeding him inside his home. So it's easier for him to find, you can move it around with tongs or leave it inside his favorite hiding place (This has the added benefit of sometimes making snakes think they've "discovered" a rodent's nest) and if you do choose to leave the pinky there for a few hours through the night or however, it won't be dangerous for him.
I would try to feed him every four days, perhaps three if he's younger or not showing any signs of stress from the offerings.
I'm reluctant to use scenting on a snake that was previously eating well without, but I will if they start to lose weight or I feel their hunger strike carries any risk to their health. So while I still recommend a lot of patience and experimenting with small changes first, you can always turn to scenting if he continues to refuse and gets to the point where you think it's needed. Bullfrog tadpoles are one possiblity, I just recommend you freeze them first. They'll hold longer that way and hopefully it'll kill off any parasites/diseases/fungi etc it may have had.
I think it's wonderful that you care so much about Paco, but you have to remember that you haven't had him for very long yet and that snakes in general can typically go a few weeks without even losing weight.
Best of luck with him! 
