The navs and most if not all IFS set ups are lacking in down travel and by adding a spacer you have lost a little there as well, especially if your shocks are not longer to compensate and with out the UCA's you are very limited.
The rear is working well and you seem to be getting allot out of it, HOWEVER the front doesnt look like its moving at all and that is obviously where the problem lies.
I would get those UCA's in ASAP and go for an entire different coil shock combo and throw away the spacers.
You will find places like Ultimate suspension, Monster Rides (adjustable thread) and even Bilstein (adjustable clips system) will offer a longer shock stroke to compliment your extra travel gain
when using an after market UCA.
Personally i dont rate Ironman suspension at all as i have herd to many people who are just not happy with it and for all sorts of reasons from ride to how many km they got out of it before sagging or failure ect