The problem I have with 512 diff is that my internet connection is not stable enough for my 280MH when using my pc and 420MH when away

I need about 2 minutes to work on a 512 diff, but if my internet is not stable I loose those shares in the ashes.

 [01:54:11] Accepted 4a7939d3 Diff 880/512 GPU 0 at Pool 0
 [01:56:18] Accepted 01b931a4 Diff 38K/512 GPU 0 at Pool 0
 [01:58:34] Accepted 6c67debc Diff 605/512 GPU 0 at Pool 0
 [02:00:31] Stratum connection to Pool 0 interrupted
 [02:00:31] Pool 0 difficulty changed to 512
 [02:02:28] Stratum connection to Pool 0 interrupted
 [02:02:28] Pool 0 difficulty changed to 512
 [02:03:11] Accepted 732c3c06 Diff 569/512 GPU 0 at Pool 0

When using vardiff its OK because I did not loose that much high rate shares. So the variance for me is not balanced with the time, but its going down with the time. I got random disconnects and will lose high value shares.
I cant fix my internet connection as the whole family is using the Internet, and also the ISP provider is kinda sucky.