Stage 1-5 works almost same with all styles so you can just see a Power replay (which are plentiful) to see how to do that. 1-4 and 1-3 differ somewhat in the beginning since the Power strats for those rely on the boost recharge. The best Strong 1-4 I know is a bit tricky and involves charging by auraing the big ships and you obviously need to be careful not to kill them.
Nereid has a good B-S 1-4 vid.I don't really remember much about Strong 1-3. Possible recharge spots are the tanks coming from the top at the beginning and auraing the first yellow ship as you activate a hyper there. Can't really remember anything good in Youtube.
1-2 is not worth much with any ship but that works pretty much the same with Power and Strong too.
For reference, that DVD first loop has a bit over 170 billion entering 1-5 and contains no boss milking. With C-P, I normally have around 180 billion at that point so the difference in potentials is not that huge.
I also wasn't expecting him to bomb a lot to lower rank, which seems like something I shouldn't do as I would need all the resources I can have, so I wouldn't want to waste them. I'm sure the better scores don't do that. I also didn't know you could bomb during the transition to a boss and keep the chain, but then why would you ever do that outside of lowering rank?
Why would it need some other reason? The end game bonus for spare resources is minimal, so why not get something useful out of the bombs?