Our league oil pattern has been different this year than it was in the past.
In the past, it was pretty forgiving -- good ole THS.  Now, we seem to have an much more extreme wall starting just inside 10. If you miss right one of 2 things is likely to happen: the ball crosses over and you hope for a brooklyn or the ball rolls out and you get a washout.  Sometimes you get lucky and the ball actually hits the pocket.  We usually have plenty of oil in the middle and I seem to have much better luck/consistency playing a deeper inside line with my Swamp Monster or SmashR and trying to avoid the wall.  For the last couple weeks, it's been a little dryer in the middle.
Based on my description, would this be an overblock condition?  I suppose some would consider overblock to be kind of the same as THS.  It's definitely not as forgiving though.

bigfoot,

sounds like a good old fashioned wet/dry to me; if you're a Bones' styled "flinger", this can give you grief. This pattern is where you have 3 basic choices for balls and several choices of delivery modifications to deal with it.

Balls:
1. Use very mild resin like the Rot-Grip Sonic-X or DynoThane Barrage to play a normal shot going out into the dry,
2. As strider said, use a strong oil ball and keep it inside the dry area the whole path to the pocket,
3. Use a control ball like the old Lane#1 Pro Purple or Viper, Storm Bolt Pro, Columbia red Pulse, Visionary Purple Ice, etc to play your normal shot. These smaller hooking, control-style balls do not react violently off the dry nor do the over-skid on the oil.

Deliveries:
1. Throw it faster and with less revs (and maybe more rotational axis) to reduce your normal backend,
2. Throw it with more of an end-over-end, to achieve the same purpose as #1,
3. However else you choose to make a more controlled release.

Or even combine balls and delivery style.
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"Just because you can do something does not mean you should do it."