I can appreciate your frustration: the research says there should be no link between your symptoms and silicone implants yet you have these problems.
In your situation, it really comes down to you ulimately making the choice as to which is worse, no breast implants, or breast implants with problems. It's a difficult choice and one only you can make. We, as professionals, can quote you the literature and tell you there is no association but it is your body and you feel there is definitely some causation.
To answer your question, about whether the implants are any safer, I would say generally, no, but we know a heck of a lot more about them now. In fact, some of the same implants that were devleoped in 1985 are being used today; the so-called third generation or memory gel implants. All implants bleed silicone similar to the way an intact balloon "bleeds" air and slowly deflates overnight without any rupture or holes. This would take a million years for a silicone implant but small amounts of silicone do leech through the outer membrane and may be responsible for capuslar contracture and your blood levels of silicone.
A lot of research has gone into altering the membrane to make it less permeable (leaky) and diminish silicone gel "bleed". We feel this has improved the overall safety of the implants. However, please realize that even when bleed occurs, most of our research tells us that it is essentially inconsequential on a microscopic basis to your overall health. I know this jives with your findings and overall condition but therein lies the problem.
In my mind your options are: tolerance, removal, or saline replacement.
IN ANY EVENT AT 15 YEARS POST-AUGMETNATION, PLEASE GET AN MRI TO EVALUATE IMPLANT INTEGRITY. If your implants are ruptured, this is all a moot point and you should remove the implants.
I hope this helps!