too much water drowned the miller
too much pudding will choke a dog
toujours perdrix
out of one's league
overaffect
flattering
embarrassment of riches
overgood
overshift
overlay
weigh down
overshare
overtheorize
overinventoried
throw one's luck in with
overexpect
anti-good
outsuck
a bit much
goodun
pronoia
fandumb
misbudget
overcredulous
futz
overglamorize
overissue
overidentify
strike lucky
jinx
strike it lucky
overexpectant
fool's bargain
over one's head
settle for
overinsure
overencourage
overdiscount
overestimate
overcritical
overpersonalize
hypercritical
make peace
overplay one's hand
overrater
over-accommodate
miscreed
not as black as one is painted
hold up as
overdeal
retuner
overesteem
Micawber principle
be thankful for small mercies
to one's advantage
proud
overween
too good to last
crawful
overinsurance
overcharitably
-valent
overrank
goodish
overreckon
overwriter
overclaim
overoil
hoarding
happy chance
break
good luck
curate's egg
overtill
overhail
underinventoried
overaccentuate
self-deception
every cloud has a silver lining
overenjoy
self-deceit
lash
harsh one's mellow
silliness
overdo
off-day
pessimism
overestimation
gooder
more than one cares to mention
curdle
overpayer
overappraisal
mascot
overvaluation
turn
self-important
avarice
overread