The car is beautiful !
You have 2 issues.
1. You have an air leak somewhere, most likely at a fitting or connection. It may not be leaking fluid out, but it is definitely leaking air back in. That is why you have bubbles coming back into the M/C when you let off the pedal. You have got to find the leak.
2. Those aircraft brake lines were not meant to run the whole car ... just the flex points where the suspension is. I have had veteran race drivers with very good feel ... feel the difference at the pedal in 12" aircraft lines versus 18" lines.
There is no concern of the aircraft style brake lines failing. That's not the concern. But the inner hose is a high grade Teflon tubing material. Under high pressures (1000 +/-) ... the Teflon hose DOES flex. If you have this aircraft hose on 4 corners, averaging 15" per wheel (5') ... it is a small amount. If the whole car has these brake lines ... say approximately 24-28' ... the lines are flexing ... and absorbing some of the pressure as opposed to applying it fully to the brake caliper pistons. This requires more brake pedal pressure to achieve brake pressure in the caliper pistons.
There's more concern ... because as you actually drive the car, under hard braking, and the caliper pistons experience oscillation, knock back, etc ... the lines flex & absorb this pressure fluctuation ... you will have less braking force ... and you won't feel it much at the pedal to know you have a problem.
This is both a feel & function problem. The brake pedal will always feel soft ... and you will have way less braking force than you should.
I hate to be the messenger with bad news. But, you need to replumb the car with hard lines & use the aircraft flex hose at the corners.
You are going to have a lot of fun with this sweet ride.
Best wishes.
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