you should prolly replace stunfisk with a fire, grass, fighting, dark type (dd,moxie scrafty puts in a lot of work imo)
swanna and scorlipede are also not very good and you will most likely need to replace them later in the game
which mons are you using?
i did a fighting monorun and i cant remember having much trouble (then again i traded my mons at the very start and they were ev trained....)
my dd/moxie scrafty won a lot of battles even carried me through ciel (moxie heracross also put in a lot of work for me)
i have a 5iv one w/ avalanche and i can teach it waterfall (which is better then aquatail imo)
i can change the nature to adamant but it will prolly take a few min