Feeding every week or every 2 weeks works for the human calendar, but snakes don't get hungry on schedule, nor do they understand schedules. Many snakes do well being fed every 10 days- in other words, a week & a half...see? If you need a reminder, it's easy to mark it on your calendar, & if you miss a date, remember that wild snakes don't find food on schedule either- ie. a rigid schedule isn't necessary or natural. However, having some idea of when your snake fed last helps to keep from OVER-feeding them, which is more common than "not enough".
I'm not going to advise you on what your snake should be fed right now, as I don't weigh prey items, & I no longer keep BPs (I have in the past). I go by how the prey looks (size in relation to the size of the snake) because I've been keeping snakes for many years. But many snakes (of all kinds) that are 1 1/2 years old do well being fed roughly every 10 days.(Remember I'm not seeing your snake- & I'm assuming he's not overly-thin or on the heavy side.)
BTW, since you just changed his feeding from every one week to every two, the most likely reason he'd be glass surfing is hunger.
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