I just think that DMT is by itself so odd and often randon and the experiences vary alot, that experience with extremely different visuals is nothing new. But it is interesting that you have found a new "mix" which can alter the DMT experience by itself, enough to be noticed by every user. Also the longer duration is rather interesting.

It's just that DMT can raise the "bizarre bar" for almost every person who visits "that weird dimension" enough times.

The extended duration is probably because of the harmalas from the changa residue