the answer is simple. bitcoin price fell. hence, the earlier buyers were able to fetch a better price for their bitcoins than the later buyers. so when balancing was done, additional shares were given to them. but this is the part i do not understand. in the first place, if every order was treated independently, and each one had just enough "bitcoin worth of money" to buy a neptune, how did the balancing resulted in the earlier buyers getting 90 additional shares for free?
Hi @pharker, the bonus shares are 45 per machine (only on the first two), not 90 and yes, you are in right about the balancing... To change/adapt the "54$" value to bitcoin change rate for every buying untill the effective payment was a crazy idea that somebody still doesn't understand...
The four orders benefit together from several resources/privilege (eg. queue, facilities,...), so another reason for "balance".
Shares of equal fixed quota/value between machines, beyond protecting the gain/profit of the mining activity, can be traded homogeneously and can be managed without go crazy... (eg. somebody who now or in the future will have this kind of shares: 1 #2 + 5 #3 + 2 #4... can you imagine this multiplied X 130 maybe or...?)
@pharker later I'll write you a PM, I think I found a solution!

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I'm sorry for this quick update, today was a busy-day here...

Tomorrow I'll post extended infos and soon I'll start to deploy some web service on the domain I just bought "insanebtc.com" that will be hosted on a server of mine and is obviously intended for our mining farm!

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I've updated quite almost the new Tx/corrections on the spreadsheet, please have a "bit" of patience more and I'll update the rest till now!
About the "signature ability"... better and detailed reasons about "why" you should use it will follow tomorrow. Consider that the ability to "sign a message" from your address IS THE ONLY PROPERTY/IDENTITY PROOF YOU HAVE and that matters!
Thanks & Cheers!
-akw-