Lowryder 2 yellowing from bottom up...

[sladOs1]

I couldn't bare to wait watching all the leaves going yellow due to this deficiency so I flushed it with 6 gallons of water just now...only time will tell..
Last time I flushed, around middle of the third week, the plant improved and perked up considerably...seemed like it was overfed at that point though so I'm not sure how well it would relate to this Mag deficiency. Everything points to a lockout though so hopefully the plant will be better off after this...

 

[sladOs1]

Waiting for the plant to recover, hoping it'll back down on this yellowing asap....
I'm still wondering why the two biggest colas are so slow to flower at the top, they've both been burnt a bit by the light...could this be why?
Other than that they are progressing nicely in flowering further down, this problem is only present at the very top of those two where they are still green with no pistils or anything....attached a photo with the biggest one circled in red

 

[sladOs1]

anyone??the main cola is still not showing much progress, I have to go an inch and a half down from the top to see the same progress as in the lower flowering sites...the top is still green...
I'm thinking I might have to harvest the lower buds earlier and leave the two biggest colas to mature a while longer, would this pose a problem?
Here's some photos of one of the lower ones, the trichs mostly milky with some turning amber, this is currently day 63

 

[sladOs1]

echo..?if anyone knows or might have an idea why my main cola is still green/not flowering properly please let me know....
this is my first grow and I would really like to learn more and this is one of the things I absolutely do not understand, seems like the Epsom salt turned out to help btw

 

[sladOs1]

just want to add this last update...I started harvesting on day 65 and I just snipped off the main cola now on day 78:

, overall happy with my grow and I'm very thankful to the people who gave pointers and advice when I needed it the most...!

the smoke was good btw