You have me confused, Kal (Matt was right I am in the ballpark -- usually way out in left field...LOL!). But following your instructions, it seems like I would get strips of 2-6-14-30-62-126, etc. I must have missed something, since it works for you.

It seems like it would be easier to set the timer to 20 seconds (or whatever time one likes to work with) with the lens closed down to the smallest aperature, and then expose each strip separately, opening up the lens one stop each time...if one wanted each step to be one stop apart.