1) should 2 waves be landing in the same second which one hits first?
The one with the earlier ID attacks first.
Source.
2)when supported does the support then fall under researched perks in that city or does it have the perks from the city which they came from?
It comes from the city the troops were made in.
3)whats the most time a wave can jump foward or back when launched -/+ 15 second 30 seconds?
30 seconds.
4) how does the game calculate battles? i have had LS waves hit before and they have killed much less than i expected, even more than when simulated with the defender having all premium perks researches luck tower everything.
Are you sure the defender didn't get some last minute support?
This is one of the best guides out there(it may be a bit inaccurate since it was last updated in 2011, but still a very good), but there are a lot of them in the
the Guides Section. Also, I'll throw
this one out there about timing attacks.
P.S. Look at
this guide about naval combat(again, it was written in early 2010, but still a good read).