I too have this same issue with slight movement of the engine mount. No cracks evident – fortunately.

Even after setting the gear down pressure as low as possible yet still allow the gear to extend properly, and having adjusted the actuator length so there is no actuator load on the assembly in the down and locked position.

So I checked for free movement etc of the strut, the links etc – all fine, no binding anywhere. Having disconnected the over-centre links from the nose strut, I yanked the over centre links up and down – what I found was that the engine mount moved forwards and backwards a few millimetres simply due to the leverage acting on the engine mount / over-centre link from hydraulic cylinder (even with dump valve open).  The mount really doesn't appear to be strong enough. My kit was a 2008 supply, and I believe the "design" changed a few years before this…… I understand earlier mounts are somewhat more robust in this area.

I have 4.5MB video if anyone interested – but send me an email directly and I'll forward as too large to post on the forum, I think.

After some discussion with a professional builder, I am now working on making up some carbon fillets (prob around 12 BID, and similar in concept to the upper engine mount fillets reinforce the upper engine mount bolts).  The idea is to flox these in behind the firewall and up against the side of the nose gear tunnel. Care obviously needed to make sure they clear the strut / fork on retraction, but idea is to size / position these such that each can accommodate an AN4 bolt that penetrates the firewall a fraction inboard of the engine mount plate and immediately adjacent the nose gear over-centre link mounting point brackets and pulls up on clamp pieces machined to fit over / inside the bracket.  I'm hoping this will be sufficient to stop the mount moving forward, and also reinforce support behind the engine mount  when there aft loads on these nose gear brace points.

Appreciate any comments and others' experiences / solutions or alternative ideas (other than removing engine, removing engine mount, and reinforcing the engine mount and putting it all back together again…!)