Suzuki dt 40 has a miss at wot

[BOAT DOCTOR]

I have a two stroke Suzuki 40 (1996). Motor runs great up and until I give it full throttle then it starts to miss like it would be on a rev limiter but not close to the rpm do do that and if I back down a little on the throttle the miss goes away not sure what it could be leaning toward a bad ignition coil but would like to be sure also after a good run my number two plug I black like I'm losing fire but hard to pull the plug wire off and check while running at wot any suggestions would be appreciated things I've done clean carb checked compression which is good 130on both cylinders the one funny thing is when I put it on a spark tester the fire is there but then instead of both sparks jumping straight across the tester one cylinder starts jumping long ways toward the other spark which I find funny any help on this thanks