Did you find an ideal number of coins to combine to get good stake results or doesn't really matter (i.e. can combine all in one block). I think finding an orphan will be bad with a single block, no?
Orphans don't matter for staking. If an orphan block is generated, your aged block is still there and will try to stake again but it may take a few hours or a day. More details here
http://wiki.hobonickels.info/index.php?title=Proof_of_StakeThe only thing that matters for staking block size is that larger HBN blocks have higher staking priority so will stake closer to the ten day threshold. This isn't too big of a deal though because if a block takes longer to stake you will actually get a larger % stake that should compensate for the extra time.
what presstab said is correct.
There is no set rule, I guess the block size doesn't count as much as the block
quantities.
Let me explain.
The size of your block are tied to your wallet size (how many HBN you hold). While it's true that larger block will have higher priority for stake quicker, it doesn't really serve you if you're wallet holds 1000 HBN. (you can have so much of a "big" block).
But the quantity of blocks (when you look in coin control) is the thing you should look into. I don't have an "optimal" number of block yet since I never looked deep into this, but the main idea is to have a "reasonable" quantity of blocks. I think a few humdreds is fine, a few thousand might be too much. Over time, if you grow your wallet, having block of 5 and 10 HBN that used to be "ok" at some point are now taking too much CPU ressources for what they are paying you for. So I would regroup them into bigger block.
So for a general idea (if I ever get a more precise number I'll share) if you have under 100 block in you coin control window, I wouldn't bother too much with it.
Between 100 and 500 I think is where the "sweet spot" is.
More than 500 blocks, start thinking to regroup the "younger" blocks into bigger ones.
Over 1000 block, definitely regroup them in fewers blocks.
So while size of the block matter for priority near the 10 days mark, you shouldn't to concerned by that since you'll be compensate more generously for waiting longer. On the other hand, a large quantity of blocks will drain more computer ressources and over time, you will get less stakes because you can do so much blocks in one day.
Hope this clear things out for you
Note that you might not want block too small... I think under 1HBN would be considered too small. I would regroup those regardless of quantity.