I was looking at a few languages that have Ts T and S in their phonology because I'm making a language that does the same. However, for word particles (what I call the shortest types of words, they form the bulk of the finer aspects of grammar) I want to have as large a phonology as possible so I can make as many one consonant sound words as I can that are different. However, I was thinking and I was wondering if Tsu, Tu, and Su, (mostly Tsu and Su) are too similar. In that same vein, if Ksu, and Psu, are as well, to Su and K/P (respectively), and to eachother. Also, the same with Pf, Tf, and Kf. 

As for using voiced forms to increase my word count, in my language voiced is the informal version of the language, and voiceless is formal, but other than that they are completely the same. So Papa, father, is formal, while Baba, father, is informal. 

With that said what are everyone's thoughts/expierences with using such Affricatives and the other sounds? The only languages I kind of speak that uses Tsu at all is Japanese and Chinese, but I don't speak them that well, however, Japanese is... special. 

Thank you for any help in advance!