Gene, I see you are using film caps to bypass the rectifier diodes. I used to do the same exact thing (same caps, too!).
In an attempt to share the wealth, I will offer a tip that was given to me by wattsabundant, who knows more than I do about this stuff -
For high energy AC circuits, the proper bypass capacitor is the ceramic X1 Type or the Y2 Type. These caps are considered "Safety Capacitors" because they are far more heat resistant than film caps which are more suited to audio signals.
The X1 Type is known as the 'across the line' capacitor as in a connection from Line to Neutral. These caps are rated for 440VAC and will pass a 4000V short test.
The Y2 Type is a Line to Ground capacitor and rated for 300VAC and will pass a 5000V open test.
I also use these Vishay X and Y rated safety capacitors across the AC switches to quench the arc and make the PL700B / PL700 Series II switch contacts last longer.
The UL spec for these capacitors in our application is .015uF and I use .01uF which is close enough.
Now for the good part: These caps are only $0.25 each when you but 10 or more using Mouser P/N 72-VY2103M63Y5US63V0.
Try 'em, you'll like 'em.