If I ever get Change of Heart approved by the ACBL (using 1H as 15+ artificial strong opening for Mid Chart+), here's the structure I'll use:

White:

1C: Natural or balanced 13-15 or 19-21, forcing
1D: Natural unbalanced, forcing
1H: 15+ & 5+Hs, or balanced 16-18 or 25+
1S: 5+Ss, 10 to Near Game Force
1NT: 10-12 balanced
2C: 5+Hs, 4+Ss, 10-14
2D: Weak two in either major or Near Game Force+ with 5+Ss
2H: 5+Hs, singleton if just 5Hs, 11-14
2S: 6+Ss, 10-14
2NT: 22-24 balanced

Red:

1C: Natural or balanced 11-13 or 20-22, forcing
1D: Natural unbalanced, forcing
1H: 15+ & 5+Hs, or balanced 17-19 or 25+
1S: 5+Ss, 10 to Near Game Force
1NT: 14-16 balanced
2C: 5+Hs, 4+Ss, 10-14
2D: Weak two in either major or Near Game Force+ with 5+Ss
2H: 5+Hs, singleton if just 5Hs, 11-14
2S: 6+Ss, 10-14
2NT: 23-24 balanced