Hello!
The eaysiest way to solve this problem is to use two tanks as close to each engine as possible!
And use no pumps !!!
You could skip the clunk in the reartank as long as you do not fly inverted for more than 5-10 seconds ( is it an airobatic airplane?)

If you want to fly aerobatic manuvers tye best tank to use is the Tettra "bubbleless" fueltanks from performance specialties in Nevada( also US YS-importer) as these does not have clunks at all!

Regards!
Jan k