This sim uses all averaged numbers and ignores the Health bonus growth rule for simplicity's sake.
 
BLOSSOM LVL19
Stat: Growth (Calc)      = Stat (Generated by growth%*level)  
Health: 75 (1-.5*.5)     =  14.25
Strength: 75 (1-.5*.5)   =  14.25
Defense: 75 (1-.5*.5)    =  14.25
Magic:                   =  0
Resistance:75 (1-.5*.5)  =  14.25
Luck: 75 (1-.5*.5)       =  14.25
Speed: 64 (1-.4*.4)      =  12.16
Skill: 64 (1.4*.4)       =  12.16
 
BLOSSOM LVL 15
Stat: Growth (Calc)      = Stat (Generated by growth%*level)  
Health: 75 (1-.5*.5)     =  11.25
Strength: 75 (1-.5*.5)   =  11.25
Defense: 75 (1-.5*.5)    =  11.25
Magic:                   =  0
Resistance:75 (1-.5*.5)  =  11.25
Luck: 75 (1-.5*.5)       =  11.25
Speed: 64 (1-.4*.4)      =  9.6
Skill: 64 (1-.4*.4)      =  9.6
 
NONBLOSSOM LVL20
Stat: Growth (Calc)      = Stat    
Health: 50               = 10
Strength: 50             = 10
Defense: 50              = 10
Magic:
Resistance: 50           = 10
Luck: 50                 = 10
Speed: 40                = 8
Skill: 40                = 8