Change nutrition to support building of buds

yes you can support the large colas with yoyo ties this will take stress of them and they will continue to grow also keeping fan leaves on the plant will increase your bud sizes also flowering for longer than recommended will also increase the size and density of your buds bud tend to fatten up the most in the last few weeks of flower this is because it is search for male pollen and the bigger the bud the more surface area or pistils that could catch pollen and then create seeds and reproduce obv we don't want her to get that but she will keep getting bigger and denser in the last weeks usually with most strains its from weeks 8-10 but you can flower a plant for much longer than that to the point it can actually pollinate itself this would be like week 15 of flower but by then the flowers or buds will be very very dense and your yield weight will be much higher than if you were to have cropped at week number 8 of flower though this is all strain dependant lol best of luck buddy. i think it also comes down a lot to strain genetics too some strains just yield more and grow bigger colas than others

It's usually during the last few weeks they put on the weight, looking at your plant I'd say your still way off harvest but will have a decent amount of buds at the end.