What springs for the rear?

Have some Elka stage 5s I bought used. I bottom out badly on jump landings but otherwise like them. I have the compression turned way up but still bottom out. I was told the springs were 300 lb but after checking found they were rated at 254 by eibach. Going to order some new ones but should I get 300 or 350 main spring. Mostly dunes and trails. Would give up a little ride comfort for bottoming resistance. They do have a 800 lb tender spring. Thanks

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