DEX stat on Alchemy skill

For crafting equiments, according to Coryn:
Player's difficulty is determined by three aspects: TEC stat, DEX stat, and profiency level. Every 2 TEC gives +1 difficulty. Every 6 DEX, including equipment, and avatar bonuses, gives +1 difficulty. Finally, every profiency level gives +1 difficulty. Thus player's difficulty level is calculated with this formula (all numbers rounded down):
player_difficulty = (TEC/2) + (DEX/6) + profiency_level

So my question is: Is the formula above same for crafting items in Alchemy skill?
By adding points to DEX stat will increase player's difficulty when crafting synthesis items?

 

synthesis is affected by item level, profiency level, TEC, INT and DEX.
i don't know the formula, but item level vs profiency is the most influential factor and TEC is more effective than INT and DEX.
(for blacksmith crafting it's the same but with STR instead of INT)

 

thank you for your information