What's wrong with being 10 boards over with the Doom?
There is no rule saying you have to throw the same line with either ball.
If you are back towards the track already with the Doom and the ball never moves then sand it down to 1k or 2k with no polish.
I watched Wayne Webb in local masters tournament use the same exact ball play up the 1 board and then next frame swing from 6 th arrow. Btw he struck both balls so it left still wondering which line was better, awesome bowler kind of makes you sit and go dang wish I could do that.