spendorlex: I love your enthusiasm and your desire to improve and become a very good bowler. Keep pressing forward and you'll get there.

Now, if I can make a suggestion. At you're current level of experience, don't get caught in the quicksand of too many balls and drill combinations. Apply the KISS principle (Keep It Simple), and you'll reach your goals faster. Along these lines:

1) Limit yourself to a straight forward 'flare safe' 1:30 drill pattern (i.e. label leverage) on symmetric equipment. This means that the pin is slightly above and to the right of the ring, cg in center of grip. No weight holes will be required. The advantage of this approach is that you'll get a roll that can match up to a variety of patterns, and allow you concentrate more on mechanics and less on equipment.

2) Limit yourself to no more than 3 resin balls (heavy, medium, light) + a plastic spare. Too many balls too soon just adds to confusion and will inhibit development.

When you get to a consistent 205-210 average with the above 'arsenal' you should have enough experience to effectively experiment with more diverse drills across different balls.

It takes discipline to avoid picking up another new toy, but if your goal is to improve, put yourself on a ball diet and move forward.
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"Yeah...what Jabroini said"

Splendorlex,
You say that you bought the ball used. Do you know what the surface of the ball is?  It is possible that the previous owner altered the surface.  It sounds like the surface may be something less then box.  Possibly 600 grit and polish or 800 and polish.  If you don't know were the surface is, I would take it to something that you know and start from there.  A good 75% of the ball reaction is surface prep.

**Update**

Tried it in leagues for the first time tonight.  Started out pretty decent, I went to a new driller and I really like what he did with the pitch and such in my thumb.  I was basically standing on 25 and throwing it right through the second arrow, down the boards and in.  I was getting it high, but getting decent carry and covering my spares.  179 the first game, which is decent for me.  

The second game I went to hell.  It started in the 9th of the first, and I went downhill from there.  One of the worst games of the season, I was getting TERRIBLE over/under with the ball.  Around the 8th frame I finally figured out to play a completely different line, and got further outside playing just inside of the first arrow.  I carried this through the third game and posted a decent series in the mid 500's, which is, again, decent for me.  It seems that this ball REALLY needs the dry if it's going to do anything.  The carry down of the shot in the second game killed me, and not till I got outside the oil did I start throwing solid strikes.  It cleared the heads even outside really well, but a bit too much skating if it catches any oil.  

Next week I play to start outside and try to stay outside and see if I can have success that way.

I did ask the previous owner about the surface, and he said he did mess with it.  He didn't like the reaction so brought it to 1000, still didn't like it, so then he said he brought it back "close to box."  I don't know if that exactly means 600 or what.  Should I maybe take it in and have them bring it back to 400 and polish it up?  I would really like that skid/flip reaction, that's really what I wanted the ball for, so I will consider plugging and redrilling.  (Just hate to go through that, and I don't know how much more it'll cost me!)