Aggression towards siblings

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DS8 is hugely sensory seeking, needs lots of vestibular feedback and likes throwing himself around, climbing, pushing chairs over etc.

Being at home is obviously exacerbating the need but he's also really increasing the 'aggression' towards his brother DS3. It's not aggressive in its motivation, he can't help his need but we can't find anything that helps calm him enough. He throws himself at all of us but we are bigger so can manage it.

We try and make sure we are there to always redirect DS8, intervene and protect DS3 but it does feel like just that, protecting DS3 at the minute.

Just looking for anyone who has had similar situation, I worry about DS3 getting physically hurt but also the emotional trauma it may cause.

Ds used to do this, still does occasionally. Few things that have helped us.

Lying under a weight blanket.
Weighted neck wrap.
Squishes under a therapy ball or peanut (ds lays on the floor and we squish him obviously gently with the therapy ball). This was his teachers idea, it works really well.
Laying under a bean bag.
Sqeezing him tightly.
He likes to wrap himself up in a duvet whilst we gently push him into the mattress. Changing to a foam mattress also helped as it is very firm. He will often throw himself onto it.
Trampoline - he will throw himself backwards onto it. Good job we have a net!

Some of these things sound really strange but they give him the sensory feedback he obviously needs. We have a friends who daughter uses a squeeze vest, you can manual adjust the pressure. Not cheap but they can be rented.