if you breed double-gene to double-gene, and if none of the parents is a super-form or something that acts like a super, you get:

1/16 = 6,25% normals,
1/4 = 25% single-gene morphs,
3/8 = 37.5% double-gene,
1/4 = 25% triple gene,
1/16 = 6,25% the quadruple gene jackpot.

if one has mojave and one has lesser, you get 1/16 single-gene mojave and 1/16 single-gene lesser. if both have lesser, you get 1/8 single-gene lesser. so it gets less complicated, and the list of possible results gets shorter. but overall, your odds are the same.

these odds only change if one of them is a super, or if one of them is a combo like a highway, mystic potion, or lesser + mojave BEL. when its double-gene (super-form or allelic combo) to double-gene, you get:

1/4 single-gene
1/2 double-gene
1/4 triple-gene.

no more normals, also no chance to get a 4-gene combo. and when both parents share a gene, that doesnt matter, the odds only change when one parent contains a super form or one of the allelic combos.

so, for example, pastel enchi to pastel enchi gives you 1/16 normals, 1/16 super pastel super enchi, and so on, just like in the first example. but super pastel to super enchi gives you 100% pastel enchis.

there really isnt much of a difference, in your case, between lesser pastel and pastave. with a pastave, the clutches will be more diverse, but at the same quality level. and if you happen to come across another awesome two-gene combo you didnt consider so far, as long as its a combo that can reproduce itself when bred to a normal, dont worry about the odds, they will be the same.