Week 5 of flower starts tomorrow and I think my bu...

Your plant is healthy. Don't treat it like foie gras. React to deficiencies and toxicties as you normally would, but don't get smart and try to force feed it more. Genetics is primary factor for size of resultingn colas - assuming good health an some attempt to max out DLI (daily light integral, read wiki). However, if you grow out too many branches/colas, the overall size of each will suffer whiel the yield will rmain relatively the same. DLI (light) determines potential yield along with genetics. So, if you capture the light in the entire area (specficialyl the top of leaves fill entire area) and limit it to 2-3 colas per sq ft, you'll maximize yield and should have decent sized buds relative to the genetics at work. More colas than that just means more trimming effort, smaller buds, more larf at bottom and same yield ... Embarassingly, it took me too long to figure this out. I remember asking some people if this effect was something that occurs after i grew some plants with fewer colas than i normally did and seemd to notice this trend, and was met with incredulity when i brought it up. The 'experts' i asked in a large chat channel here essentially said more colas = more buds and that is far too simplified relative to reality. That set me back 2 years before i found much better info about this and going to be more dedicated to implementing it in a systematic way. (check out cocoforcannabis dr photon's corner.. the comments to these articles are iffy, but sometimes the conversations are worth it too).