Yup.

I have a couple of UCD's ( including the old discontinued Giant Scale one ) that I run with inverted glow.

One runs with a Saito 1.00 with no modifications what-so-ever, including no loop ( which is not a bad idea ).

The Saito comes set up with an almost ridiculously rich low speed setting ( and the engine still runs fine this way! ). This cause fuel to siphon either out or back into the tank fairly quickly.

However once I had the LS properly set siphoning slowed down to a managable slow drip.

All I have to do is keep the throttle fully closed while filling the plane or while it is sitting in the pits.

Once I am ready to start it, I'll open the throttle up and crank the engine over to start WITHOUT priming.

That's it.

The engine runs just fine this way and siphoning is not a major issue.

If anything because you are forced to get the tuning "right" to prevent siphoning, the plane tends to be very reliable and never deadstick.

Check your LS tuning. Do a pinch test.... set the LS needle so that removing the glow driver causes no perceptable change in RPM's, and you'll be in the ball park.