Hi Richard.... the setup your describing is geared around speed , so lends itself to the match side of carp fishing . If speed isn't an important factor just go for inline & short rig straight through . Also I personally think loop to loop for any leader will definitely be the weakest point & 99 times out 100 the loop on the mono will give. Leaders when used especially longer lengths should be joined with the appropriate knot .
Your always get different views on leaders so don't let that bother you ,but unless you really need one then it's safer not to use one .
Big fan of tubing personally.