270 for 8 would put you in the 330 range for max. Try doing some rack lock outs with about 365 or so. Holding that weight in your hands will kill your forearms. Even if you dont do the lock outs try doing some lower rep ranges at the end to handle more weight and stress the arms more. Also do heavy rows and pull ups. Overhand or hook grip dead lifts will put alot of stress on your forearms as well.
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Cheers i might try some lock outs, i row on a plate hammer strength machine with about 350-380 and weighted pull ups max is 90 x 5 reps ( i weigh 207) so my grip strength isn't that bad, it's mass wise. I was doing a five day split up until a month ago i decided to amp up my program as follows:
Monday: Chest, shoulders and tri's
Tuesday: back, bi's and forearms
Wednesday: legs
Then i start again with 1 rest day on Sunday. So hopefully with this i can beef them up to match the rest of my body haha.