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I also switched to 2W resistors. Have you measured the temperature with no PWM (light off)? That's when the resistors are going to dissipate at peak current. Even though mine are 2W they're reaching about 80 C. Are you running on 230V?
I made it with an IRF840 as well. Works very well with an incandescent bulb. I had a flicker before but it was caused by my PWM source, once I worked that out it worked flawlessly. Tried with a dimmabled led bulb but it wouldn't dimm (100% on always).
I made it with an IRF840 as well. Dimms well an incandescent bulb, but there's a flicker about once a second. I'll try using an inductor in the output to check if it fixes the flicker. Tried with a dimmabled led bulb but it wouldn't dimm (100% on always).
I tried it on a dimmable led bulb but it didn´t work. The bulb stayed on 100%.