Kickspace heater

I have a loop hot water system. The system is feed with 3/4 pipe 2/3 of loop, when it gets to the ksh in the kit it drops to 1/2 to feed the heater and the rest of the system.
Also on the last bbr it is feed with 1/2 and the return line is 3/4.
My q is it ok to loop right thru the ksh and reduce the rest of the loop to 1/2 or should the heating con have used a monoflow t and keep the hole loop 3/4? And on the last rad in the loop it is feed with 1/2 and the return to the boiler is 3/4 is this ok? my e-m ad is joseph_damore at avid.com Thanks