Hardening of Kodak Negs?

I have been producing very "soft" negatives with a tendancy to scratch. Is there any way I can harden the emulsion before archiving?

I'm developing tmax 135, 120, 220 under optimum d76 conditions (all kodak chemicals)at 68 degrees - manual agitation is no issue. Should I move to TMAX chemicals for better grain?

Thanks

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