I was safe for 2 days until I got bored of slow pace and abused again so here is what I did. Like you said you can tweak your mastery points anyhow you want, Maxing runes dosen’t get you banned either. Your stage clear along with your lvl and hear gotta make sense, for example 400 stage you should have dwarf lord set pieces with crusader etc. And lvling your stats such as str, hp and def should be done according on your calculations with gold, don’t have 1000+ points of str at lvl 30 it makes no sense. I used relic shop and spammad it for some gear and runes (No ban) until you buy full op set like phantom or something. I summoned 5x heroes mimmic and event goblin per day. I didnt touch gear mimic. I got banned after getting high lvl equipments through relic shop and made them all 100+ lvl while being lvl 80 so the game caught me also it could be players reporting you got enchanting them that high