If you use stick on weights on the horizontal stabilizer may I suggest that you do not stick them on the under side but instead on the top side next to the vertical stabilizer. The reason is that double stick tape is more likely to let go on the underside and after an undetermined degree of oil soaking from the exhaust.

It may look not so pretty there however that's better than the possible alternative when your weights let go in flight. Have seen this often.

John