CLCK 3.0 amoeba growth probability?

[CWS]

I have some troubles finding the corresponding amoeba growth probability from CLCK 3.0 to GDash.

In the official Boulder Dash games and construction kit the probabilities are 3.125 % and 25 %. So only two values available.
In CLCK 3.0 you have 8 different values (0, 1, 2, 3, 4, 5, 6, 7)

Growth probability 2 in CLCK is the standard value 3.125 %. Growth probability 5 in CLCK is the standard value 25 %.
Growth probability 0 can be set but is always reverted to 1 after a test game. So only 1, 2, 3, 4, 5, 6, 7 can be used.
Growth probability 7 is THAT fast, that it reaches 200 parts and is converted before the player hatches. This seems to be 100 % in GDash.
Growth probability 6 is also that fast, but it reaches 200 parts at the same moment the player hatches. Could be around 80 % in GDash.
And after some more tests I think growth probability 1 in CLCK is about 1.9 %.

Just what I found: 2 is 4/128 and 5 is 4/16. I suppose 7 could be 4/4 (as this would result in 1 = 100 %), so with this math 6 could be 4/8.
With this formula growth probability 1 should be 4/256 which would result in 1.6 % in GDash - but with this value the growth is much slower than in CLCK 3.0 (so I have to use about 1.9 to 2.0 % to get similar results if I run CLCK 3.0 and GDash simultaneously).

But what are the other corresponding values? What's the correct math behind it?