Hi J_w73:
I bowled on the Shark pattern for the first time last night, so I'm now an expert (kidding). My specs are very similar to yours, maybe a little less revs, so maybe my experience will help you.
During practice, I tried my most current "oiler" (Storm Dimension @ 4.5 x 3, 2000 Abralon) straight up 8, 10, 12, 5 - nothing. Skidded about 58 feet. This house has fairly new synthetic lanes which I find always play longer and slicker than any other surface I've ever bowled on. But still, I was left wishing I had made a dentist appointment...
What I ended up doing was throwing an old Track Rule GP2 solid particle at about 1000 abralon. Mind you, this ball is the biggest steaming turd I ever dropped $200-plus on. But the one thing it does do well is to make its barely-noticeable move consistently at about 25 feet - even on ice. For the remaining 35 feet, it just rolls straight, but at least it rolls. I lined up left foot on board 18 and targeted straight up 11 right to the pocket. Then it was a matter of concentrating on each shot and really grinding. All I worried about was trying to take every bit of muscle out of my swing and release and just hit my mark. I ended up actually turning the ball much less than normal, which probably sounds counter-intuitive on a slick condition. Bottom line was just get the ball to the pocket and then make your easy spares. Ended up with only 3 open frames over 4 games (2 splits, 1 washout) and shot 872 with a low of 203.
There are several 215+ average bowlers in this league, but most of them continued to try to bend the shot. I saw every ugly split and washout imaginable and a bunch of 150 and 160 games. I want no part of that.
I think most decent bowlers get so used to seeing the long and angular trajectory of today's aggressive equipment, which is undeniably awesome when you have area. But on a truly difficult condition, that look can be your worst enemy. In my opinion, the best approach on these conditions is to play as straight up the lane as possible with the smoothest, rollingest (I made that up) shot you can muster. When you play very direct, you can get away with minor variations in your speed and release, as long as you are accurate.
As far as equipment, for tough conditions I will always keep in my arsenal at least one particle, one urethane, and maybe even a solid reactive drilled pin-axis...
-Scott in PA