yeah, tie'em down, or top them. I'd wait for 6-7 nodes to top, but you can lst the moment their roots can handle it... so err on the safe side.
An ancher tie-down in opposite direction of the bend can help alleviate pressure on roots... keep it low on trunk and have it slightly taught to start, before you bend the plant.
bend it down between the axial growth. they grow out and 90-degrees from each other - this allows all an equal chance to grow north... otherwise, a few loop around and stretch like crazy, at which point even if they are the highest branch, they won't dominate growth due to limited vascular tissue leading to it. use a stake or another tie-down to prevent any arching in the trunk (apical meristem). that'll promot even growth.
Anything below the bend is likely trash. can cut it off now.
so, after it's bent down, make sure none of the growth takes the long way, so to speak, in the coming days. Keep everything even height.. if one shoot dominates, bend it down lower for a day.. doesn't typically require a tie-down, but that'll make it happen too. release them when things catch up.
at this point, i maintain my plant's height until i have a base large enough for vertical shots to fill evenly... it's in bloom at that point or shortly after..