V-Core 3.1 wide boy (with motion system from 4) has high vibrations in y at 125 hz

Im building a retro fitted 3.1 wide boy with v-core 4 motion system and toolheads from the 4 (named 3.1.4 from chiefdotjs :D) i have freshly rebuilt the frame and im using beacon on the one toolhead and a nozzle adxl on t1. The printer is standing on my wooden floor (colleague suggested that maybe a rug could influence that)
I have checked all the screws they should be tight, i when i manually execute oscillate freq=125 time=60 axis=y i cant feel the electronics panel vibrating which was one cause in another thread i checked I have checked the belt tension via west3ds belt tension meter, tried 2.5 and 3 on all belts. The rails moved freely before belting and adjusting the frame with beacon My bed mesh is within .18mm which should be good enough So im out of ideas on what to do/try, any suggestions maybe? 😄 Im also using the 35mm nema 17s with 48V and gates belts