So why 20% fees for masternode payments? This essentially will create twice as many nodes and create a much higher cost to spy on the network. It also creates a larger feedback loop for the price (because as darkcoin is taken out of the supply, it drives the price up), which is good for all of the investors and security of DarkSend. Miners will get less coin, but it's been proven time and time again that when you decrease the coins generated the price will just go up to meet the cost of mining.
Avoid multiple tickets for masternodes. It will reduce number of nodes making the system less resilient.
Fully agree with AlexGR. Also, IN THE VERY UNLIKELY INSTANCE if coins are stolen, you won't lose the WHOLE LOT. I will continue to maintain separate MNs.