From what I've heard they are compatible. It's possible you just had really really bad luck. Or that one of your hets isn't really a het. I've read other posts where people bred hets for 2 or 3 years before finally hitting on a morph. So it does happen even with definite hets.
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Slytherin Serpents

Have you been hugged by your snake today?

Ball Pythons
1.1 Normals het Caramel (Edward & Bella)
0.1 Normal 66% ph Caramel (Rosalie)
0.1 Caramel (Bellatrix)
1.0 Hypo (Nick)
1.0 Honey Bee (Aragog)
0.1 Hypo Pastel (Nagini)
0.1 Spider 66% ph Hypo(Nymphadora)
1.1 Mojaves (Lucius & Renesme)
0.1 Pastel Lesser (Narcissa)
0.1 Pinstripe (Arwen)
1.0 Pewter (Salazar)
0.1 Bumble Bee (Alice)
0.1 Lemonblast (Luna)
0.1 Blond Pastel (Katie)
1.0 Bell Pastel (Jasper)
0.1 African Dinker (Esme)
0.1 Normal (Madame Olympe Maxime)
0.3 Normal Babies 66% ph Caramel (Edward x Bella)
2.1 Pastel "Dinker" Babies (Jasper x Esme)

Corns
1.1 Normals het Amel, Anery, Charcoal, Diffused, Hypo (Romeo & Juliet)
1.0 Blizzard het Diffused (Tumnus)
0.1 Anery Lavender het Amel (Lucy)
0.1 Plasma (Victoria)
0.1 Opal (Jewel)
0.0.22 Babies (Romeo x Juliet)
0.0.18 Babies (Tumnus x Lucy)

Hogs
1.0 Albino Western (Hogwarts)
0.1 het Albino Western (Hufflepuff)
0.1 Tri Color (Molly)

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