Rubber bands are literally OP. If you don’t have rubber bands on your DR4B, you are simply doing it wrong. (Mae this isn’t passive aggressive lol I’m just saying fax)
If you plan on going down the Douglas le Reverse Four bar route, I would highly recommend reading through this: DR4B Tutorial by 333A
But I would also recommend not building a DR4B for rise above, as it is much higher than it needs to be.