Meh there is no problem honestly, it's the difference between having a set of i110 gear and i120 gear. i120 is meant to take time, i110 gear can be obtained through soldier tomes + ST drops. So now you have poetics, the point of poetics is to pick the job you plan to focus on for content the most but honestly you don't need x gear unless you are doing certain content otherwise you are just overgearing yourself for the situation.

If your objective is to obtain the best of the best gear for each job then it is going to take time, you can do coil to try and speed it up, you can cap poetics every week to speed it up but if you want to get your alternative jobs to a higher Ilevel then you have to look to soldier gear and other methods that are a little weaker than the best of the best.

If it was so easy to get the best of the best for each job then there would be no point in having soldier tomes because then everyone would just focus on x method to obtain the i120 for each job. The whole point is poetics=main job, soldier=alternatives, yes you'll be weaker, yes you won't heal as much, your hp won't be as high your DD won't be as good but it's not like it's the end of the world if you are using weaker gear.

You have to decide which job you want to focus on for coil for the best results or if you really are deseperate to obtain "high end" like tier gear then go through the materia-meld concept, it's been shown that coil I believe was beat by a group that took the time to upgrade their gear through crafted gear and than over materia it and ye know what it's a completely legit method to obtain a better dmg rate compared to what you are limited to through poetics.