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On my 1978 P, there is only minor difference between boots and no boots.
In the past I have suffered a slow DG, even though slaved. A no-gyro vectored approach and reasonable ceiling made it a non-event. It turned out to be a crack in the thin, semi-clear hoses that run from the shuttle valve above the P2 rudder pedals individually to the two instruments. The hoses are 20 + years old. There are four lines, two to the instruments and two smaller to run the dolls eyes on the vac. gauge if memory serves me right. BTW, even with the cracked hose, I had good vacum indicated and both dolls eyes were in as I am pretty sure the vac gauge takes its readings from the join on the inlet side on the far left of the P1, just before the hoses disappear downwards. On the right hand side hose on the instrument side of the shuttle valve about 3" up, there is a T which connects to the boots and draws them down and if I remember correctly, that is controlled by a timer valve on the P2 side, on the firewall. My manual is not here, but I think that is correct. The tubing on mine has actually cracked several times in the past based on various repairs. I am in the process of replacing all the hoses with thin walled rubber of the appropriate specification as the existing tubing is now quite brittle. My suggestion would be to check the vacum to the AI and check the hoses for cracks. If you disconnect the AI and block the end where is attaches to the AI, you might be able to hear any leakage. Most instrument shops will do an IRAN on your instrument which is cheaper than replacing it. Hope this helps. Blue Skies = Dave 
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