For the DT strat, here's some things you can do:
You can get the E at the very start with a wallride (wr) and land with a grind on the ledge below. If you have enough speed on this ledge and high enough ollie stat you can wr up to the lower roof and get the tape from there.
There is a small chance you could wr up to the lower roof from the ally you start in. Which would make starting off tape, S very quick.
You can get T from either side.
If you can do the quick E>tape I like: E,tape,S,1,K,2,3,4,T,A,5. Even if you can do the straight to tape wr I'm not sure if it'd be faster than getting the E first and doing it from that ledge, because having to get E>4 later would slow you down.
Another totally different route I like is: E,4,T,A,5,S,1,K,2,3,tape. Just not sure how fast 3>tape would be, I think about the same as 3>E if done well.
Another thing I'm not sure about is which character to go with. I know it's one of these three: Tony Hawk, Bucky Lasek, or Geoff Rowley. The character select screen takes a long time to go from one character to an other, so that's why Tony Hawk is an option, he has the highest speed along with Bucky, 2 less ollie than Bucky, but is 3 less characters away. I didn't think the 2 ollie points could make up the 5 seconds it takes to select Bucky unless it made a new macro strat possible. Which could be the case for DT level. I don't think it will matter for any other level. Geoff is option because he has a special grind and this would make the competition levels faster. Geoff has the best stats of the special grinders and is 2 selection scrolls.
Thing About Geoff is I think he'd lose major time on school and mall with 2 less speed, but would be full speed by DT I think. There is the possibility of doing the levels out of order. Such as doing chicago before mall or school, or even doing school up to the secret tape and pro score, quiting out and coming back after Chicago to get SKATE and tables.
It's very hard to say who would be best I think you'd need to try them all and try the different level orders for geoff and possibly tony.
"Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence."