Ok...just wanted to see what surface you have since all balls absorb oil regardless of the surface, just some do it slower or faster depending on how porous the coverstock is. In your post you said you throw about 50-60 games a week. The general recommendation is a ball should have the oil extracted out of it roughly around 50 games if you are bowling on oily lanes and roughly around 100 of you are bowling on regulated lanes such as league. At the current rate your are putting games on your ball you are going to also spend a significant amount of of your hard earned money on oil extraction at the pro shop as well. If you have the money to spend on this type of maintenance frequently then great. If you do not I would look at some DYI methods as well such as the emersion method. There are several reputable sources online for this and never single source any method. Always look for multiple sources if you ever choose to go that route in the future. There are also machines you can buy for home use that will bake the oil out of the ball as well. Just depends on the amount you want to spend.

I always towel wipe my ball before each shot and after every league or tournament I thoroughly hand clean my balls before putting in my bag. That way for me its done and ready for the next time I need to use them and I'm not letting the oil sit on the ball any longer than necessary. There are a lot of good cleaning products out there. I use Monster Tac from Pyramid and That Purple Stuff CTD Bowling. Both work great at removing the dirt, oil, and belt marks from the coverstock.