I took a quick look into your profile.
You're pretty much a single class crafter with just LTW lvl 16 having only Waste Not... Oh boy, life must have been tough.
Indeed, cross class skills is one of the biggest issue for you. All-15 is highly recommended, which would have made it A LOT easier to level CUL. Please do yourself a huge favor, and get All-15, so that you can have a much better life towards CUL 80.

Second, there is a huge difference in stats between HQ and NQ crafted gear. So in the future, please try your best to acquire HQ instead of NQ. I understand HQ offhand would be very expensive, but at least for the belt and accessories, they're not that hard to be crafted. If you don't plan to level all classes, it's best to have a friend who is an omnicrafter, so you can just provide him/her with mats and have a cheaper way to get HQ gear.... especially when there is still a long way towards lvl 80.

Third, it's time for you to unlock "Specialist", which will add a lot more stats to you, and also allow you to access to a huge variety of specialist skills. Please see my crafting guide Chapter 40 (http://ffxivrealm.com/guides/ff14-ad...e-tsukino.156/)

Forth, you don't seem to realize "CP > control/craftsmanship", as you have been using very low level accessories. Accessories are your main source of CP, and it's very important to maximize CP in this game... more important than maximizing control or craftsmanship. With CP, you can recover durability more easily, and use skills such as Ingenuity (BSM 15) that would reduce the recipe level for 5 steps, which has a similar effect to allowing lower level of craftsmanship for higher level recipes.

Fifth, you NEED a better rotation that utilizes more level 15 cross class skills, especially Ingenuity (BSM 15) and Tricks of the Trade (ALC 15). If you feel that completion of progress was tough for you, then ARM 15's Rapid Syn may be an option for you as well. Rumination (CRP 15) and Manipulation (GSM 15) are also things that may help you. Byregot's Blessing and Steady Hand II have now become regular crafting skills, and you need to know how to formulate a Byregot Finisher Phase in your rotation. Please see my crafting guide Chapter 10-12 (http://ffxivrealm.com/guides/ff14-ad...ie-tsukino.39/)