NESRGB modded AV Famicom with display issue

Hello all, I have the following signal path:

AV Famicom modded with NESRGB purchased from eBay
Euro SCART cable with CSYNC from retro_console_accessories
Euro SCART to DIN adapter (not the JP21 one bundled with the next item)
XRGB Mini Framemeister set to PICTURE mode, using a NESRGB preset from a highly touted preset pack found online via googling
HDMI out to Panasonic VT60 plasma TV set to full pixel in game mode

When I play most games through my Everdrive N8 they look perfect, but when I play Super Mario Bros I get a sporadic, occasional horizontal line that flickers, and then while playing Gargoyle's Quest 2 I get lots and lots of flickering white dots all over the screen seemingly at random, but they scroll along with the scrolling of the game, oddly.

Do you guys think this is just an Everdrive issue? Or perhaps that the NESRGB mod wasn't done well? Or that maybe the power supply I purchased for the AV Famicom which is rated to work properly with it is doing something weird?

 

Sometimes you have to use an adapter with more current, since the rgb board adds more draw to the console. Also try a different version of the ED OS to see if it still does it.