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30gr is 30gr whether its solid copper or jacket lead.
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Wrong!
An object will tend to achieve a minimum energy configuration. A partition achieves that through the deformation process as is shown in the picture. How your bullet does it I do not know but I doubt that it is consistent. The reason long VLD bullets require fast twist barrels is that flying point first is not a minimum energy configuration therefore energy must be added to prevent it from achieving such a configuration. The bottom line is what does one wish for the bullet to do once it has expanded.
I personally do not mind tumbling bullets because that is what we used and that makes a non-expanding bullet cause a larger wound channel (with less penetration). However one simply should know what a bullet is going to do before using it for serious work. Having been down the road with semi wet newspaper I don't do that anymore being as the result can be very misleading.