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Grade 8 bolts will be ok in Aluminium but standard bolts are sufficient in strength. If you are shearing the standard bolts then you are overtightening possibly all your bolts. Alumimium strips easily and I would avoid using a torque wrench on bolts under 40Nm, otherwise purchase a good Heli-coil set. Try using Loctite242 on all bolts and hand tighten. Then further tighten with wrench 1/8th to 1/6th of a turn. You will never shear another bolt and lose one either. If you must use a torque wrench, lower the setting by 20%.
Good luck
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