been farming since pet system update and have only gotten unique pets i guess you have to use those moolah things for splicing to get epic now.
That is simply not true so sorry have to correct you on that. The chance to get an epic pet from DNA combining was actually increased compared to the original rates. It's still low ofc, but it was not lowered to try and sell DNA Boosters. The server logs all DNA splicing results and there are plenty of Epic pulls completely in line with how I set the chances.
dont waste moolah increase scrlls on normal pets only use those on really good pet dna as normal pets arent worth the moolah. only use for boss dna.
Not really good advice. Boss pets are not majorly superior to pets you obtain from normal monsters. They have exactly the same base stats and damage as any other pet you might find from normal field monsters, and they do not gain any advantage when it comes to increasing their stats with tonics or gear either - all pets of the same type and rarity are equal when it comes to stats. The only difference would be their normal attack's debuff which have slightly higher numbers, but nothing major really, and the pets attack speed, but again boss pets do not necessarily have higher attack speed than normal pets either.
I would say that if you find a pet with skills that suit your play style or requirement, there is a major advantage to using a booster when splicing the DNA so you get the epic version with epic quality stats and scaling, making your effort of leveling, evolving, and strengthening them even more worthwhile, but pulling the Unique version is almost as good and should be absolutely fine for most.
The only pets that have additional benefits over normal or even boss monsters are pets you buy for Moolah. They have the increased stats that come with the Moolah rarity type as well as increased chance to land the debuff on their autoattacks.