Sorry I was away from the board today during the excitement. Love to hear Maxi was doing yoga with you. Since this was the second time seeing green, and such a long stretch of it, he probably felt off because of it. First time Neko saw a stretch of green she hid under the bed.
I think I gave a BCS twice, maybe three times with Neko. All three times were when there was downward pressure on her insulin dose, due to one or a combination of her IAA breaking and SRT working and causing the tumour to shrink, hence less growth hormone being output. Anyway, I never shot a BCS because of a low preshot value, but rather to drain an overfull depot. I think two of the BCS might have been the cycles after seeing BG in the 20's.

An overful depot means you can be battling low numbers for a long time. The third time was when I knew she was about to ask for a reduction (I was right), and her appetite was off, and it was a night time cycle and I was tired.
One other thing, whether you give a BCS really depends on the cat. After Neko's first SRT, she was still extremely bouncy. I never gave a BCS then because I knew she'd bounce to the moon for a while after a reduction and be safe. After she learned to tone down the bouncing, I had to be more careful. The amount you reduce the dose is also ECID. Some people start with a half dose. I found taking just 1/3 off was enough to deplete the depot enough. Again, it's about learning what works for your cat.
From what I've observed, cats taking cabergoline don't seem to have a highly predictable pattern in how or if it will impact them. It's ranged from a sudden roller coaster ride down the dosing scale, to a very slow walk down, to no impact. Uncertainty means caution is key in decision making about giving insulin. I would much rather deal with higher numbers for a few cycles than be fighting to bring up an inappetant cat when I'd rather be sleeping.
Don't worry about him missing part of a cabergoline dose for tonight. We had at least one person have to do every other day for a period of time until their cabergoline refill got shipped. Cabergoline can cause stomach upset, but I remember seeing people have that issue early on, not after 4 weeks of taking it.
And Sandy suggested, let's see where he ends up with his Lantus dose, without R in the mix, before figuring out if the R scale needs tweaking.