I did the same thing to mine on the S4. To be fair if your driving 80+ MHP for any prolonged time your intake should be cool as your pulling in a ton of air at that speed and the air scrubbing alone will cool down the intake. So there is little that the reflective tape would be doing there over the advantage of air scrubbing. Also the air passing under the intake with the bigger gap from the intake spacers will help scrub surface temps as well.
The intake spacers and reflection tape do or block two different kinds of heat transfer so you wouldn’t see a bigger difference over the spacers IMHO as the spacers are a thermal barrier blocker from the dominate heat source and the heat dissipation from the heads into the intake it stops the direct heat transfer. As that is the major source of heat obviously the intake spacers stop that transfer ability.
The thermal reflective tape helps prevent radiant heat absorption. With the added air gap of the intake spacers some of this is lessoned due to the air enlarged air gab between the block and the intake. However in low speed and low air conditions where radiant heat would increase the thermal tape really fills in the gaps there and really helps compliment the spacers and give an over all heat blocking package.
Great job it looks fantastic.