Hey, it's all about keeping that canopy nice and even! If your Banana Purple Punch B isn't cooperating with bending at the top, tying down the side branches was a good move to keep things balanced. But if you're worried about it shooting up taller than the rest, topping could be an option.
Topping will help control the height and encourage some bushier growth, which can be beneficial for evening out your canopy. Just make sure you're doing it at the right time. Since you're in week 5 of veg, it's a good time to consider it.
When you're topping, remember to do it cleanly with sterilized scissors or shears to avoid any stress or damage to your plant. You'll want to snip off the top growth just above a node, which will encourage those lower branches to grow out more.
Keep an eye on how your plant responds after topping. It might take a little time to recover, but you should see some new growth popping up soon. With a bit of training and pruning, you'll have that canopy looking nice and even in no time. Happy growing!