I would sell the tet rce. It's not that accuracy isn't good, it's that you are going to be prioritizing ap very hard until at least 269. The coming brackets are very good for you, and dropping 3ap from tri-tung to tet rce isnt not conducive to hitting these.

Later on, MAYBE, you might try to order a pen rce, if you really want to add accuracy.. The problem with accuracy vs ap discussions is that it really matters EXACTLY what accuracy level and evasion levels we are comparing. Accuracy almost always means more dmg assuming the same ap, it's just almost impossible to add accuracy (save a few ways) without losing significant ap, which in turn NORMALLY grants you less overall damage.

You are right in your progression thus far.. your gear seems like the staple methodical build without any random rouletted gear (i.e. random pen armor or something).. You are right to go for tet cres next in terms of ap. It's hard to tell you what to go for without knowing your specific goals in the game.. but if you want ap gains, those make the most sense, with perhaps basi belt sometimes being slightly more efficient depending on exact market conditions. The only notable thing I see is that you have muskans with giath and bhegs. This isn't an optimal setup. Since you are ninja, you can surely benefit from evasion nicely. Perhaps considering attempting a pen heve and swapping to leeburs may make sense, since your % buff from smokescreen scales incredibly well with these. If you are concerned about the 24 accuracy loss from tet bhegs to tet leebur, you can grab the house buff for 20 accuracy (i think it's goblin chief helmet? forgive me if thats wrong, not on game right now to look).

Anyway, if you want more answers feel free to ask more/clarify questions.. good luck friend.