10intp,
Just be glad you do not have to bowl on a full length Guardian overlay; it is THE abomination of the bowling world. I think it's sole positive is that it's cheap to buy and install; owners use it as an interim measure on their way towards saving for full synthetics (I believe).
I hear that like a good vinyl flooring in your home, unless the underlayment is in perfect and pristine condition, Guardian's effects on bowling are even worse.
It is soft so the heads seem like they wear right away, making the oil appear to disappear. After about a game of 4 or 5 person league, you get serious carrydown. IF you are VERY lucky, you can just move further inside with each 2 - 3 frames; If you are unlucky, you start seeing tons of carrydown AND you can't move inside becauss the inside shot hasn't opened up yet. You need pearls to clear the heads, yet you need strong backend balls to handle carrydown. Lefties often prevail because their side wears at a much slower rate. If you have 4 lefties on a pair, you will hear some new expletives.
All in all, I bowled on it for 2 years, and they were the least fun I've had in bowling for a long time.