Well done, my friend. Congratulations for your great success.
One of my cylinders sometimes puffs a bit for the first 3 or 4 minutes of starting the engine and after that it works great. I have no idea of which cylinder puffs because the mufflers are interconnected and the pressure is equalized. It seems like both do it at the same time which is not possible. I know one of my coils has a cracked outer casing which means there is corrosion on the inside. They are not cheap and buying a used one is a Russian roulette. I think I'll source a new one. I'm not saying that that is your problem, though.
Just keep pouring coolant in there until it tops up. Burp the circuit by pressing a water tube. You may even run the engine with the thermostat cap off to see the coolant passing trough. After a good engine run, let it cool down and check the expansion reservoir, under the reserve fuel tank and fill to the marking line. Use a small flashlight to check the level.
Check if you have tightened the clutch slave all the way and bleed the lines.
1- Open the clutch fluid reservoir and fill it up to the marking.
2- Put a tube on the slave bleeder, pump the lever until you feel some pressure building up, pump, pump, pump, hold the last one in.
3- Open the bleeder and let the oil come out (nasty stuff and it will squirt) without letting go of the lever
4- Close the bleeder.
5- Restart until you fell normal pressure right from the first lever pumping.
6- Keep re-filling the fluid reservoir and close it at the end.
7- Take some nice photos of your bike and post them here.
8- Ride into the sunset like a boss at the Lucky Luke music.