I assume you meant : Would using to heavy weight of shock fluid increase the likeliness of bending the shaft?
Yes IMO - Heavy shock fluid will cause slower transfer of energy to the shock fluid and hence more force will be held by the shock shaft as it is trasferred to the chassis.
wow, i guess I should have proofread.... ehh well, you got the idea, maybe I will tone down the weight of oil in the shocks (I was afraid I might have went overboard....)