Run testing....help me decide when

After not using my HRM for 3 months I finally sent it in to Polar and just got it back. I have observed some unexpected readings. My HR is very low relatively when I do trainer rides. While my run HR is very high. I missed about 5 weeks of running from the end of Nov-December due to illness and a soccer injury. It puzzles me and my coach so he wants me to do time trials running, biking and swimming next week. I'm trying to figure out when to do them.

The run testing is hard since I get home from work after dark. Doing it at lunch at work isn't practical since it is very hilly. It is best to do it where I can easily repeat it and I know the route which means doing it from home.

Here are the options:
1. Tomorrow I have a 6.5 mile run planned as I try to determine if I can recover and get ready for a 1/2 Mary in 5 weeks. My coach suggested I do the 3 miles time trial first and then continue running another 3.5 miles. Seems very difficult...since I'd be going out hard to for the first 3 miles.  Weather looks okay for tomorrow.

Doing either 2 or 3 might mean running when it is nasty cold since the weather looks bad next week when I'd do the testing.

2. During the week I could get up early and run before I normally get up and before work but I'm not much of an early morning workout person.

3. See if I could leave work about an hour early one day and go home and do it as dusk settles in.

I guess I don't want to do option 1 since I hope to have a nice long run and get the okay to train for the 1/2 Mary....I worry that doing both will be not a positive step towards recovery and building up distance and it is scary to think of doing.