help with copression results

[strokedually]

hi guys im new to this site and let me say "it's great" but i cant figure out how to make a new post so i made a new thread hopping to get help with that.
Well lets get to it i did a "cold" copression test pulled out all glow plugs on my late 99 f350 it came back with cyl 1 to 8 with
1-310.5 5-335.0
2-323.0 6-300.5
3-316.5 7-318.0
4-281.0 8-318.0
all in psi
i think i just opened up a can of worms

i used a mityvac {digital} compression tester

i then pluged in the block heater for 2 hrs and redid it and then it was
1-317.0 5-349.5
2-338.0 6-322.5
3-325.5 7-322.5
4-306.5 8-336.0
i left the block heater overnight 14hrs then it was
1-320.0 5-354.5
2-336.5 6-324.0
3-338.5 7-333.0
4-307.5 8-342.0
what do u guys of the results and what should i do next rebuild, sell?
please help and give me input