Regarding running 800 bladesThis is what Jan Henseleit says about running 800 blades on the TDR:
"Generally I can say after several test flights that the 800 size TDR brings no real advantages.
Lower speed and agility. More problems with blade flapping or boom strike. More load for the motor and if you take a stronger one you will get so much temperature under the canopy that this will cause also problems. Than you will also need more battery capacity which will rise the weight.
At the end you put a lot of unnecessary expensive things into a well running system to get less performance.
I think that the 700 size is a real good choise for everything.
Only if people like to cruise smooth with low rpm there is a reason for a 800 size version but on the other hand you can do this with the 700 version as well ;-)"
I beleive this is applicable for Logos and others too.