Ok thanks! Maybe I'm not heating it up enough then. I'll try to heat it longer.
Do you use syringes like these: https://www.amazon.com/gp/aw/d/B08P1YT74G?psc=1&ref=ppx_pop_mob_b_asin_title

That's what I have and I'm also worried maybe im using the wrong kind or really shitty ones?