Hey just checking the best method as my plants are...

Could I in theory just tie them to my loaf beams or use racket straps for lights to pull it up straight with allowing the plant some room to move without causing any harm whatsoever . These are all about 30 inch the biggest being 41.5 so I do expect heavy colas but I did expect any bends at week 8

Yea, support stems going into the soil or if you don't want to disturb the roots you can use a plant tie to connect the cola to a more stable part of the plant

As buds fatten up and get dense, their weight increase and so does the stress on the plant's stems with the risk of breaking so you are right to be concerned but it can be treated pretty easily with placing bamboo stakes and tying them to the colas as extra support or any other kind of support for your plant stems carrying that weight. Other than that you have nothing to worry about and can enjoy the dense buds that are slowly forming! Happy growing :)