mikebikerad wrote: The cage is also inhibiting the frame from flexing which has effected the handling/steering quite badly. You can see in the video when my front tire lifts off the ground considerably.... is that normal? .
Yes, the front wheel lifting is normal, and deliberately designed into the front geometry by inclining the steering "king pins" .
This is termed "Weight Jacking",.. and it will actually result in the inside REAR wheel lifting slightly when cornering fast.
This helps to eliminate the "push" or "understeer" that would otherwise result due to the lack of differential on the rear axle.
But also , yes ..that cage will also affect the handling, ( unless you mount it flexibly ) but you probably wont notice until you get your tyres warmed up and "working" normally on a clean race track.