diff --git a/jsf/schema_types/base.py b/jsf/schema_types/base.py
index 65da271..fd7acc1 100644
--- a/jsf/schema_types/base.py
+++ b/jsf/schema_types/base.py
@@ -33,7 +33,7 @@ class BaseSchema(BaseModel):
     provider: Optional[str] = Field(None, alias="$provider")
     set_state: Optional[Dict[str, str]] = Field(None, alias="$state")
     is_nullable: bool = False
-    allow_none_optionals: float = 0.5
+    allow_none_optionals: float = Field(0.5, ge=0.0, le=1.0)
 
     @classmethod
     def from_dict(cls, d: Dict):
diff --git a/jsf/schema_types/string_utils/content_type/text__plain.py b/jsf/schema_types/string_utils/content_type/text__plain.py
index 69ed7f9..c609b7e 100644
--- a/jsf/schema_types/string_utils/content_type/text__plain.py
+++ b/jsf/schema_types/string_utils/content_type/text__plain.py
@@ -16,7 +16,7 @@ def random_fixed_length_sentence(_min: int = 0, _max: int = 50) -> str:
         valid_words = list(filter(lambda s: len(s) <= remaining, LOREM))
         if len(valid_words) == 0:
             break
-        if len(output) >= _min and random.uniform(0, 1) > 0.5:
+        if len(output) >= _min and random.uniform(0, 1) > 0.9:
             break
         output += random.choice(valid_words) + " "
     output = output.strip()