Jim
I recommend popping the Havoc and motor back on Ebay - there's nothing wrong with them, but they were designed for 12th scale or class racing touring cars, etc. Someone will buy them back, hopefully, what you paid for them.
Given the amount drag involved in driving an off-road, you need a stronger speedo and a more powerful motor.
DB01 is a little fragile for the big stuff the pro guys put in their cars, but not so bad to get rid. If you throw a 5.5 or 6.5 into the DB01 it will rattle through the diffs/gearboxes pretty quickly.
Firstly, go looking for a good speedo. I run a Castle MMP, but GM, Speed Passion, Tekin, etc are all equal alternatives. It'll depend on your budget, but the more you invest now, means longer life span, less problems and very few compatibility issues or limits. Buy "as new" as you can afford.
Then start with 9.5 or 8.5T motor, or if you are running indoors, consider a 2nd hand 10.5T from a TC driver - you'll get them cheap 2nd hand and they'll give you enough power to get around a track. You might be slower down the straights, but it'll be more controllable and give you time to get used to the speed. I've always said only put a faster motor in, when you stop hitting the corners!
Then when you are ready to go faster, sell the 10.5 and move up the motors slowly and at your own pace.
I still swap between 6.5, 8.5 and 10.5 in my 511, depending on how useless I am that day! Whatever gets me round the track with the most consistent lap times...
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