JHCCoffee OK, that’s such a short brew ratio & atypical target for me, I thought I’d give it a go. You don’t say where you poured after the bloom, so I poured all subsequent pours in the ring.
To note if you pour 300g onto a 30g dose, you get considerably less than 300g out, I had 243g following removal of the dripper at 6:00.
The cup was unsurprisingly strong and tasted under-extracted, there was a tangy, slightly green tree bark edge to it.
Measuring the brew confirmed this with a TDS of 2.06% (around 17%EY). You could perhaps hit around 2.35% to 2.50% TDS for a typical extraction.
My good pour overs with this coffee have been around 1.54%TDS (around 19%EY). So ¾ as strong despite having 50% more water in the cup (relative to dose). So you would seem to have some leeway to extract more coffee, it doesn’t look like you are in imminent danger of over-extracting.
So in answer to your questions - Your current pour rate is 1g/s on average (with 50% actual pouring time), to increase extraction at this grind size (you obviously have scope to grind finer with the current method) you could increase the number of pulses and/or pour more pulses in the centre of the brewer at in the early stages, say 3×30g every 30s in the middle, rest in the ring.
I don’t really see any value in the 2:00 bloom.
Also dropping the pulse size to 25g every 30s (0.8g/s) could lift extraction a tad, if 30g/30s pulses aren’t extracting enough.
If you speed up the pour rate by pouring larger pulses every 30s (each pour taking 15s), you will decrease extraction and therefore strength at this brew ratio.
Frequency of pours is balanced against their size, to achieve the desired rate.
It may turn out that your strength preference falls outside what is easily achievable with a V60, bear in mind that a longer, well extracted espresso shot might be the best way to achieve concentrations over 3%TDS (1:6 or 1:5 shots).
Unfortunately, a 30g V60 dose is way too much for me, as this would pretty much account for my daily allowance, so I’m afraid I can’t pursue this method further.