You'll get familiar with how deep you can expect good buds -- if you overcrowd your space it won't go as deep. Once familiar, it can help you lollipop near beginning of flower to avoid vast majority of larf. E.g. any lower side branching at day 10-14 after flip is probably not going to produce anything worthwhile for me, your mileage may vary. Also, removing this stuff after buds are well-formed probably isn't going to 'redistribute resources' anywhere and you're just cutting off a portion of yield - albiet larfy.
Genetics are a fairly big factor too... some plants produce awesome buds much deeper than others. I never try to eliminate larf... i just prune off the stuff i am nearly 100% certain will be some trash buds at harvest. Cutting this stuff off before it forms the buds (bunches of fluffy why hairs) amounts to a guess.
Other things make for obvious larf -- low on plant and/or a side-branch is not going to draw many resources (apical dominance is the cause, not light directly hitting buds). The 'sugar' produced by photosynthesis (ATP) is highly mobie and is allocated based on apical dominance. Don't remove leaves so that light hits lower buds. This is not going to help.
Leaves are solar panels, storage units, manufacturing plants and lungs... do not remove them without a good reason. Light penetration is more offten a poor reason to do so. those leaves provide so much more than what little benefit is gained from light hitting flower... flower that has 1/100th of the chlorphyll, lol. photosynthisis isn't magic. Flower material has a fraction of the photosynthetic potential of the top leaf surface.
larf is great for extracts. Look into making ice-water hash, for examlpe. You can fresh-freeze what you cut off at harvest and let it pile up in freezer until enough warrants a hash-making event.
think of it this way... The energy provided to your garden area dictates yield (simplified). If you have too many mouths on the plant (overcrowded) that potential flower mass gets spread out more without any gain to yield and you get smaller buds and larger proportion of larf - it adds up roughly to the same mass, but obvioulsy not optimal as far as maximizing quality nugs. There's a point where more colas per area does not help yield at all and going beyond that point only causes a higher percentage of larf. Stick to about 3 colas per sq ft and you will avoid this as well as automatically getting "good enough" light penetration without any effort or thought.
cocoforcannabis has a "to defoliate or not" article that explains this more eloquently than i care to. There other guides and articles are rock solid too... leas bro-science i've found compared to any marijuana site i've been on. they are mostly filled with nonsense and conjecture... cocoforcannabis makes a real effort to avoid that nonsense.
Unless it is an incredibly inefficient light, 300w should be fine for 8 sq ft of photoperiods (12 hour operation being the factor that matters). If it is a high efficacy light, you may even need to dim it 5-15% for 12 hour operaion. With autoflowers, you may only need 60-70% power with 18 hours of operation (or for photoperiods still in vege phase on 18h operation). So, i doubt your light is cause for excess larf.