i didn't catch what Omni clear you were using?
if it was me i would use a slower reducer.
i would use the MR187 it says slow but is faster than what you think
wait 15-20 minutes in between coats
why would you get runs in the BC????
if so wait a hour and sand them out with 1000 grit.
clear if you are using the mc161 HS it mixes 2-1 and doesn't lay real good imo
put at least 3 coats and wait 15-20 minutes in between coats.
use the clear coat MH168 Hardener it says slow but its not,perfect for the temp and a all over.
hope this helps,Travis
PS take your time in between coats of base and clear you will a ton of better results