Hi Eric
Just focusing on Pondering I think I am right.
1) Computer B since Computer A gives it full 30 seconds gets the benefit of 3000 Positions
2) Computer A since it only receives 10 seconds for pondering now gets 333 positions instead of its 1000 positions.
Computer B with 3x setup has a 3:1 advantage if computer a gets its full 30 seconds to ponder which is the same 3:1 advantage when not pondering.

However since computer B only gives it 10 seconds the result is 333 or 1/3rd of what it should get. This means while pondering Computer B gets instead of a 3:1 benefit because the 3x speed. It now has 9:1 in their pondering modes and 3:1 when not pondering.
Computer B always stays at 3000 positions when pondering 30 seconds or calculating 30 seconds.
Computer A is 1000 by calculating 30 seconds and 333 (10 sec) when pondering that is 9:1 under ponder.
Hence bigger ponder mistakes because the search depth with 10 seconds makes bigger Ponder mistakes.

Regards
Nick

Oh wait you are right.. I forgot Computer B moves in 10 seconds so the 3000 becomes 1000 so it is still 3:1.
But still making the other computer do possible ponder moves at 3 ply is obviously worse than 5 ply so there is a bigger handicap for computer A.