First of all, this is just my opinion, not advice, so please don't take it that way. I noticed the front brake was grabby from the first day I bought my brand new '93 Vulcan 750, and it stayed that way for over 80,000 miles, and several sets of brake pads, cleanings, and fluid changes. Different tires made no difference. I decided that the Vulcan 750 simply had too much front brakes for it's size.
When I bought my '02, it felt the same way. Just barely squeeze the brake lever, and it wanted to lock the front wheel. Very touchy. Rear brakes on both bikes were fine. Finally after putting about 20,000 miles on the '02, I decided to try something. I completely removed the left front caliper and hose. The brake suddenly felt normal, and worked fine. I did extensive testing at a large open area free of traffic, including controlled stops from an indicated 100 mph with the front wheel held on the verge of lockup. It worked fine every time, and stopping distances were uneffected. I went ahead and removed the rotor, and have since put over 25,000 miles on it, under all kinds of conditions, including a lot of stop and go city riding, mountain riding, and long trips. The brakes have performed flawlessly. They do not overheat, they do not fade, the pads do not wear out any faster (and now the front brake only requires one set of pads) there has been no noticeable rotor wear, I have been in a lot of close calls since then, and the brakes worked perfectly every time, holding the wheel right at lockup, where it would have locked up before, with both discs.
Quite simply, I think dual front discs are overkill on a bike the size and weight of the Vulcan, though they could have been made less touchy. Many much larger bikes have less front brake swept area than the Vulcan 750 does, and stop just fine.
Now, under no circumstances am I even suggesting anyone do this, only that it has worked fine for me, and has been proven safe (IMO) by 25,000 miles of day to day use. As with any other modification, if you do it, you do it at your own risk. But I can't see how what I did is any more dangerous than a brake that almost locks the wheel (not a good thing) every time you touch it. Jerry.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike