Questions re use of Test Undecalyte before a vacation

I am going to brew some test undecalyte to shoot before I take a 10 day vacation. I haven't brewed it yet - if anyone has I welcome suggestions/experiences with concentrations / solvents used. I'm wondering if I can brew it at 325-350 mgs./ml without ending up with sore knots where I injected.

More importantly, I'm wondering how much I should shoot before leaving. I normally use about 750 mgs. of test enanthate per week, and would like to shoot enough Test U to come somewhat close to similar plasma levels of test during the vacation.

Thanks in advance!