I started mining this week using the following:

Miner: Claymore (Solo ETH)
Pool: Nanopool
Graphics Cards: 3x GTX 1060 6GB MSI Gaming X Edition
GPU software: MSI Afterburner = Undervolted @ 60% TDP (72Watts) +700MHz memory overclock.
OS: Windows 10 Pro

I am getting a stable 22.3 MH/s per card (approx). So around 67 MH/s in total. I know i may be better off mining Zcash, but i choose to mine Ethereum. I have my reasons for this.

I do have 3 more cards to add to my build, but they haven't arrived yet.

This is my Nanopool chart: (Look from 4th of July onwards.)
https://eth.nanopool.org/account/0x2ebd7c60feb6bbeac4142ec862d46a44fb68be82

As you can see, the chart shows 4 things:
A.) Calculated hashrate
B.) 2-hour SMA
C.) Accepted Shares
D.) Reported Hashrate

I'm not too sure what these^ mean. There is quite a fluctuation for A.) and also 2 drops in D.).

Now when i compare this to some of the other ETH addresses in the top 15, their charts seems more consistent with less fluctuations in all areas.
For example:
https://eth.nanopool.org/account/0x548efb023462c347992def94428a9a4565ac231a
https://eth.nanopool.org/account/0x3ed80e6274637a3cccb097e39e911a1882b03023

Granted, these are significantly higher total hash rates, but i'm querying the consistency.

So my questions are as follows:
1.) What is the difference between reported hash rate and calculated hash rate?

1a.) How do i make those two line up more like the above examples.

2.) Why do  the accepted shares have such a variation and how can i increase this or make it more consistent?

3.) Why has my reported hash rate dropped on those 2 drops? It's only for a few minutes, but time is money. + Why haven't the other stats dropped along with it?

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Thanks.

Please answer in as much detail as you can.