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What you can do in Risk Profile is select the gear icon in the lower right side of the screen under Positions and Simulated Trades. Then if you click "More Parameters" it will give you the option to change the IV for each expiration manually. So if you want the front exp to drop 15% and the back 10%, this is how you would do it. Also you want to move the exiration date to the earnings date or beyond to account for delta. They don't really help in terms of figuring out how much the vol is likely to drop for each expiration. You would have to look at the historical data for that I suppose.