Hello, I also did a review on Tepphar 830k... I got my usual pair 28x30 and it fits like all my other tepphars.... So I think you may have just gotten a pair that's bit big.
I tried 835L 28x30 at the store and they fit like my 830k.. However like Phukette suggested they will stretch out.
And yes diesel sizing is very strange lately, 608t for example it's such awesome wash but man it fits crap vs older thavars like 811p or even my 808z.
Also heard that new tepphar 838v...