Just remember 3/8 bee space.
Actually, the recommendation is for capped brood (not capped honey) on each side of the undrawn foundationless frame for the very reason you observed.I understand that to get the best comb that it is recommended by some to have capped brood or honey on each side of a new foundationless frame.
Your experience with an empty FL frame between honey frames mirrors my experience. Bees like to draw honey storage wider than brood comb. I recommend against placing a FL frame between honey frames. In the brood chamber, an empty frame between two drawn frames can be done with no issues.I am just embarking on a foundationless experience. I understand that to get the best comb that it is recommended by some to have capped brood or honey on each side of a new foundationless frame. I have found out why with my first super which had uncapped honey next to a foundationless frame. They continued to draw out the uncapped honey until it intruded on the new frame's space.
Since I lack capped brood or honey, can I instead use a block of the proper thickness on each side to do the same thing?