3 inch lift coil springs install HELP

[nrb's70gmc]

long story short (truck is a 1970 3/4 ton)

intalled new upper and lower ball joints (c20)

wanna do a offroad (prerunner style truck)
baught some 3 inch lift coils (c10)

the new springs will offer a nice ride with a bit of lift

old stock springs measure at 13 inches (out of truck) these will slip in and out wihout the use of a spring compressor.

new 3 inch lift springs measure 15 inches (out of truck)

using a internal spring compresser (I compressed the new springs down to 13 inches) they slip in the coil buckets like the stock springs.

the problem is the rod of the spring compressor is sticking to far out the top of the coil to properly seat the coil in the upper coil bucket.

when you let the tension off the compressor (make the rod even with top of coil spring) the coil isnt compressed enough to fit in.

and then i twidle my thumbs again.

the reason for the internal compessor is that its more compact and i thought the other type of compressor (external) would not allow the room.

What to do-what to do???? at a stand still now.