I'm looking for the ball for Heavy Oil Condition(7 boards Wet/Dry, 40FT)

I'm thinking about drilling BW or No Mercy for the condtion, but
I don't know which is better choice for me.

I am 195 average bowler with 17~18 mph, Mid to high track/mid tilt,300~350 rpm.

and I already have Power Drive Sanded, but it didn't work well on that condition. I will be waiting for any good opinions.

I'd go with a Black Widow and get it drilled with the #1 skid/flip layout. That's what mine is and it doesn't over curve when the lanes have a little less oil than normal. Also, I have never seen a ball hit the pins as hard as a Black Widow.
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High Game: 278 (Doom Raw Hammer) 12/2/06

High Series: 705 (Doom Raw Hammer) 12/2/06

My Current Arsenal,

Hammer Black Widow
Doom Raw Hammer
Ebonite V2 Strong/R
Tropical Storm

Photos Of Balls I Have Used In The Past 2 Years.

http://s99.photobucket.com/albums/l290/crusher267658/My%20Bowling%20Balls/

Hawg Zilla excellent oil ball with carry down.