Usual preface, I’m with PreciseBits so while I try to only post general information take everything I say with the understanding that I have a bias.
Saw their first but same reply might be useful to you:
That said. The Makita and it’s like have another issue. The only part of the collet that produces the clamping is the tapered section. It’s only 4mm… That makes it much easier to not have enough slip resistance depending on the router and collet matching.
Hope that’s useful. Let me know if there’s something I can help with.